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Discussion Starter · #1 · (Edited)
Ok, doing my part to add some of the data back into the forum...

This should have been made a sticky back in the day! How about this time around???

If you know even a little bit about your car, '94-'96 civi Caprices, and '94-'95 Impalas came with the bogus oil "idiot guage", which is wired to an oil pressure SWITCH, as opposed to a sender. This provides no real idea of pressure, just that 5psi or more exists. The resistor is tied to ground, and wired in the circuit to prevent the guage from pegging, once oil pressure breaks the ground from the oil pressure circuit. One way to fix it, is to remove the 68 ohm resistor out of the harness, and install the SEO 9C1 oil pressure sender. It is a 0-80 psi sender that only reads about halfway on the guage, as the LT1's and L99's only run about 40 psi going down the highway. Nothing wrong with that, but many don't like the guage reading that "low". Back in 2001, my way of doing it was to remove the 68 ohm resistor out of the harness, and install the oil pressure sender from the early 90's C/K series trucks. It is a 0-60 psi sender. The part # is 12553175, and can be had at your dealer for about $35. You'll aslo need a 1/4" female to 1/8" male pipe threaded adapter to make the sender fit on the stock plumbing. Under the hood, remove the bogus switch, and install the sender + adapter. In the dash, you need to find the resistor which is located in the harness wrapped in annoyingly sticky tape, just above the glove box latch, and remove it as well. Aside from that, it's plug and play. Better yet, the sender will put the needle to 2/3 on the guage at 40 psi, as opposed to the 1/2 way on the guage with the SEO sender. This mod can be easily done on 9C1's too, just don't bother with the resistor part, as 9C1's didn't have that crap.
 

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I'm looking at a caprice LS that has the gauge almost 3/4 of the way across.


is that good for a civi ?
 

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Discussion Starter · #4 ·
I'm looking at a caprice LS that has the gauge almost 3/4 of the way across.


is that good for a civi ?
Looks like a stock civi idiot guage setup, meaning it has 5 or more psi.
 

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Thanks I appreciate this info, I installed the 9C1 sender in my SS already.
The gauge reads low, but I still have the resistor in the line.
Can I just change to a different resistor to get proper reading, instead of buying another sender?
 

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Thanks I appreciate this info, I installed the 9C1 sender in my SS already.
The gauge reads low, but I still have the resistor in the line.
Can I just change to a different resistor to get proper reading, instead of buying another sender?
Just remove the resistor. No need to replace your new 9c1 sender.
 

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Finally a picture. Thanks turbochris...
 

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I have a 9c1....Should I be concerned my needle goes only half ways...Also lately, My car has been acting up...I noticed the needle drops close to red when I let off accelerator on streets and jumps back to middle when I gas it...It stays in the middle on highway speeds.
 

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Thanks HuSSker and Turbochris.

*sigh* another homework assignment to do. :D
 

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Thanks I appreciate this info, I installed the 9C1 sender in my SS already.
The gauge reads low, but I still have the resistor in the line.
Can I just change to a different resistor to get proper reading, instead of buying another sender?
To answer your question. Yes, you can re-size the resistor to put the needle anywhere your comfortable on the gauge.
Seems many are happy with the resisitor removed.
If your going to play with values, keep the old 1 for a starting point
 

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To answer your question. Yes, you can re-size the resistor to put the needle anywhere your comfortable on the gauge.
Seems many are happy with the resisitor removed.
If your going to play with values, keep the old 1 for a starting point
Seems to me that this is saying to cut the wire and leave it open, in order to not to complete the resistor circuit. If that is the case then the wire could be cut anywhere, correct?
But then if I add different resistor the circuit would need to be completed to have any effect?
I'm confused.
 

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Discussion Starter · #18 ·
The resistor is between the sender wire, and ground. Removing the resistor will generally put a 9C1 sender around 1/2 way. Adding ANY reisistor into this ciruit will cause it to read LOWER. If you want to bias it higher (which is kinda lame in my opinion) you need to feed +12v to the resistor.
 

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Seems to me that this is saying to cut the wire and leave it open, in order to not to complete the resistor circuit. If that is the case then the wire could be cut anywhere, correct?
But then if I add different resistor the circuit would need to be completed to have any effect?
I'm confused.
Sorry to confuse you.
Because you asked...
"Can I just change to a different resistor to get proper reading, instead of buying another sender?"
I answered yes you can do that, meaning re-size the existing resistor (in the completed circuit)
Stick to what HuSSker says, just cut out the resistor, leave it open.
 

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New question,...
I went to buy the truck sender #12553175 at autozone, all they had was duralast ps 220,but the box`says switch. Is that the switch or the sender? I googled it and the 220 did not equal the right #. The above listed part number translated into a ps262. Any help or input?

Thanks alot,
ZACH
 
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