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Discussion Starter #1
PLEASE email me at [email protected] with any questions or to place an order.

I have been building, installing, and shipping Z28 Clusters for our beloved Caprices/9C1s/Impala SS since April of 2001. Two years ago I began to offer Z28 Clusters for the ’94-’96 Roadmasters. Here is a revised post for the Z28 Clusters I currently offer.

For the ’94-’96 Chevys:
I take one of my Z28 Clusters, build my own custom harness so it plugs into your dash connectors, trim the outside of the housing, check and clean all of the bulbs, check the calibration of all the needles, set the odometer to whatever you want. I include a tach signal wire with the correct PCM pin (except the ’96 Impala SS since the car is already wired for the tach signal). Included is a polished (used) lens or an optional new GM lens, and can also install white needles in place of the red needles (think ’96 Impala SS) as an option. I can also make the needles any color you might want.

Please note that you lose the Low Washer Fluid, Change Oil, Door Open & Gate Open (wagons) and Low Fuel lamps. You also no longer have a PRNDL with the Z28 Cluster (perfect for floor shift conversions or 6-speed cars). Also, to allow the Z28 Cluster’s oil pressure gauge to display actual oil pressure on civilian cars, you will need to replace the oil pressure switch with a 9C1 oil pressure sending unit, and remove a factory resistor in the wiring harness above the glove box.

Typical Installation



Gray painted gauge separator



Acrylic stick-on PRNDL



Pricing for the Chevys is as follows:
’94-’96 Caprice/9C1 and ’94-’95 Impala SS for $285 shipped (within the 48 States) with used polished lens. New lenses are no longer available from GM.
’96 Impala SS (which includes my purchasing a tach signal divider and building it into the harness so the tachometer displays properly) for $385 shipped with used polished lens.
Gray painted gauge separator $25.
White needles (or any other color needle) instead or red needles $25.
9C1 oil pressure sending unit $30.

You can save $50 off the above pricing if you already have your own Z28 Cluster and send it to me, I will complete the above listed modifications and ship it back to you.
If you can send me the connectors from a digital B-body cluster you can save an additional $25.

************************************************************************************************

For the ’94-’96 Buick Roadmasters (sedan and wagons):
I take one of my Z28 Clusters, build my own custom harness so it plugs into your dash connectors, check and clean all of the bulbs, check the calibration of all the needles, and set the odometer to whatever you want. I assemble it all with one of my custom faceplates in matte black. I include a tach signal wire with the correct PCM pin, and a used polished lens. I can also paint the faceplate whatever color you can provide me, or cover the faceplate with (stick-on) carbon fiber or woodgrain (to closely match the Roadmaster interior woodgrain). In keeping with the Buick factory gauge look, I can also install white needles in place of the red needles as an option.

Please note that you lose the Low Washer Fluid, Change Oil, CRUISE, Door Open, Gate Open and Low Fuel lamps. You also no longer have a PRNDL with the Z28 Cluster (perfect for floor shift conversions or 6-speed cars). Also, to allow the Z28 Cluster’s oil pressure gauge to display actual oil pressure, you will need to replace the oil pressure switch with a 9C1 oil pressure sending unit (no additional wiring involved in the Buicks).

Matte black painted



Gray (stick-on) carbon fiber



Red (stick-on) carbon fiber



Bill Crovo’s installation… check out the woodgrain match



Mockup of PRNDL and CRUISE indicator on a ’93 Z28 Cluster



The pricing for the Buicks is as follows:
’94-’96 Buick Roadmaster (Sedan or Wagon) with matte black faceplate for $385 shipped (within the 48 States).
Other (than matte black) painted color faceplate adds $15.
(Stick-on) Woodgrain or Carbon Fiber faceplate adds $35. (Stick-on carbon fiber has very limited availability).
White needles (or any other color needle) instead or red needles $25.
PRNDL installed $65.
CRUISE indicator $50.
9C1 oil pressure sending unit $30

You can save $50 off the above pricing if you already have your own Z28 Cluster and send it to me, I will complete the above listed modifications and ship it back to you.
If you can send me a ’94-’96 Roadmaster cluster (or the connectors from a ’91-’96 Roadmaster cluster) you can save an additional $25.

PLEASE email me at [email protected] with any questions or to place an order.

****** Since my pictures no longer displayed in my old post, and I can no longer edit that post, I started this new one. ******

Thank you for looking.
Gary
 

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Discussion Starter #3
My 95 caprice cluster is on the fritz and I have been considering this rather than paying to have it rebuilt. A few quick questions, do I have to hook up the tach and how accurate is the gas gauge?
You do need to run my included tach wire from the PCM to the dash area. There is no tach wire in your car from the factory. I check the accuracy of the needles on all the gauges when I complete a Z28 Cluster build. My bench test set-up allows me to test the functions of all the gauges, and if i find the needles are displaying inaccurately, I reposition them and check them again. My test set-up tells the Z28 Cluster that the 'gas tank' is full, so i calibrate the needle to the full line on the gauge. This will not 'fix' an issue you may have with your fuel level sending unit inside your tank.

Email me at [email protected] if you have any questions, or to place an order.

Thank you,
GM
 

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Discussion Starter #5
Tim, I replied to your email.

As a reminder to all, that my PM box is usually FULL:

PLEASE email me at [email protected] with any questions or to place an order.

Thank you,
Gary
 

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You do need to run my included tach wire from the PCM to the dash area. There is no tach wire in your car from the factory. I check the accuracy of the needles on all the gauges when I complete a Z28 Cluster build. My bench test set-up allows me to test the functions of all the gauges, and if i find the needles are displaying inaccurately, I reposition them and check them again. My test set-up tells the Z28 Cluster that the 'gas tank' is full, so i calibrate the needle to the full line on the gauge. This will not 'fix' an issue you may have with your fuel level sending unit inside your tank.

Email me at [email protected] if you have any questions, or to place an order.

Thank you,
GM
Sounds good, I wasn't sure if it would function or not if I were to leave the tach unhooked. It will be a while before money is right, but how long does it usually take from payment to shipping? Just curious so when I am ready to order I can ballpark the mileage.
 

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Discussion Starter #7
...how long does it usually take from payment to shipping?
It usually takes me a few days from receipt of payment to complete a Z28 Cluster build and get it out in the mail.

Gary
 

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For future reference. I want to do this conversion on my car once I have it running right again.
 

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Quick request, does anyone have a picture of the Z28 clusters with the white needles?
 

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Anyone care to dispel a rumor for me?

Was told I have to make sure to “fix” the tach output from the PCM on ’96 models....that the tach output on a 96 PCM outputs 4 cylinder, while the Z28 cluster expects 8 cylinder. If not fixed the idle will show about 1000rpm too high.

Ever heard such a thing?? Of course it did not say how to "fix" it. Hahaha...

-Mike
 

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Anyone care to dispel a rumor for me?

Was told I have to make sure to “fix” the tach output from the PCM on ’96 models....that the tach output on a 96 PCM outputs 4 cylinder, while the Z28 cluster expects 8 cylinder. If not fixed the idle will show about 1000rpm too high.

Ever heard such a thing?? Of course it did not say how to "fix" it. Hahaha...

-Mike


Not trying to be a dick but why would the PCM read only 4 cylinders? Just tap into the tach out from the PCM and enjoy your new cluster!
 

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Not trying to be a dick but why would the PCM read only 4 cylinders? Just tap into the tach out from the PCM and enjoy your new cluster!
Found it on this forum, in this thread: http://www.impalassforum.com/vBulletin/showthread.php?t=244602

What I got from it is that the PCM for OBDII sends out a 4cyl signal. Only the '96 models are OBDII. This is not an issue on the 94-95 models.

Specifically it says in the thread:
"either the Z28's Gauge cluster will have to be modified to use the 4 cylinder tach signal that the 96 Impala SS outputs OR you will have to reprogram the computer with a Camaro / Firebird automatic transmission PCM calibration. When making the Impala SS cluster GM used 4 cylinder tachometers, I'm not sure if I want to know the reason for that"

My car is a 1996 Roadmaster. Have always wanted to do this swap, and have a cluster on the way...

-Mike
 

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Well that is interesting. If your cluster is coming from Gary then I wouldn't worry about it as he makes them plug and play. I would send him an e-mail if your not getting it from him.
 

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Discussion Starter #16
Found it on this forum, in this thread: http://www.impalassforum.com/vBulletin/showthread.php?t=244602

What I got from it is that the PCM for OBDII sends out a 4cyl signal. Only the '96 models are OBDII. This is not an issue on the 94-95 models.

Specifically it says in the thread:
"either the Z28's Gauge cluster will have to be modified to use the 4 cylinder tach signal that the 96 Impala SS outputs OR you will have to reprogram the computer with a Camaro / Firebird automatic transmission PCM calibration. When making the Impala SS cluster GM used 4 cylinder tachometers, I'm not sure if I want to know the reason for that"

My car is a 1996 Roadmaster. Have always wanted to do this swap, and have a cluster on the way...

-Mike
Mike,

I just received an email from Bryan Herter (PCMforLess.com) confirming that the '96 Roadmaster PCM factory calibration outputs an 8-cyl tach signal.

On a side note... if someone programmed a '96 Roadmaster PCM like a '96 Impala SS it would be a 4-cyl output (meaning if the '96 Roadmaster PCM program was based on the '96 Impala SS PCM base calibration). In this case... either a tach multiplier must be used, or the PCM should be recalibrated using an 8-cyl tach output for the Z28 Cluster's tachometer to be able to display accurately.

Gary
 

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Mike,

I just received an email from Bryan Herter (PCMforLess.com) confirming that the '96 Roadmaster PCM factory calibration outputs an 8-cyl tach signal.

On a side note... if someone programmed a '96 Roadmaster PCM like a '96 Impala SS it would be a 4-cyl output (meaning if the '96 Roadmaster PCM program was based on the '96 Impala SS PCM base calibration). In this case... either a tach multiplier must be used, or the PCM should be recalibrated using an 8-cyl tach output for the Z28 Cluster's tachometer to be able to display accurately.

Gary
Thanks very much again for the fast response Gary!

-Mike
 

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Just got done with my Z28 cluster install in my Roadmaster wagon. Want to thank Gary very much for all the help. He got right back to me and answered all my questions, and is helpful and great to work with.

I had an issue with the oil pressure gauge reading too low when I first installed my cluster. It caused some frustration but the fix was easy. Originally I installed an O'Reilly aftermaket sending unit for a 9C1 Caprice. I swapped that for a Delco sender for a '96 Z28 and it fixed the problem. Sender was $45, so a little pricey, but well worth it. Make sure to pick up a sender socket as well, about $10 at most parts stores.



Oil pressure us fine now!



Before the mod. Here's the old cluster. Bye-Bye Granpa!


A couple other good things to know. The temp gauge gets it's signal from a different location on the engine than the readout on the climate control when in diagnostic mode. In my case the gauge reads a little higher, but that's just because of where it gets it's signal.

A really good upgrade is to swap the Z28 bulbs for 194 bulbs. The Z28 cluster is dimmer than the Roady cluster. Putting the 194 bulbs from the old Roady cluster made the Z-cluster much brighter.

Roadmaster gauges are backlit blue/green, and the Z-cluster is white...unless you get the PRNDL option, which lights up blue/green. I tried adding 194B (blue bulbs) first but it just looked wrong, so I went back to the clear white bulbs. It looks odd the first time you drive at night but after 5-mins you'll be used to it.

The dash panel behind the cluster does need a good bit of trimming to get the cluster to sit correctly, but Gary builds the Roady units using older Roadmaster clusters, so the mounting points are all the same, and once the dash is trimmed correctly, it sits perfect and for all the world looks factory.

This is a great mod and well worth the effort!

-Mike

 

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Before the mod. Here's the old cluster. Bye-Bye Granpa!
Yes, but 'grandpa' would cruise at 80 MPH, instead of 10.


Must agree, it is a great mod. I have had the Z28 cluster from Gary in the 96 RMW for close to 3 years. Absolutely worth every cent! Tach worked right away with the included wire and connector pin. Also purchased the correct range oil pressure sender from Gary at the same time, since it would likely be difficult to get where I live.


Here is it with the woodgrain version:



.
 

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Hmm, I've been thinking about this mod. I guess I didn't realize I would loose the P R N D indicators....

So why just 50 bucks less if we send you our clusters? I'm curious. Thanks.
 
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