Okay I figured it out.
The harness is in between a dashboard bar and the dash itself. The photos I found (thank you) show that harness pulled down to get access to it. I did have to remove the trim panel. There are 2 clips holding the harness in place, and they're behind the panel. A little squeeze and they pushed through. Then I was able to pull down the harness. Removed the electrical tape and found 2 wires wrapped separately. Who invented this stuff? ugh!
There's a tan wire in the harness. One end of the 68 ohm resistor is tapped into this wire. The other end is connected to a black/white stripe wire (ground, according to my manual). I cut the resistor off the black wire and viola, I have a real oil pressure gauge! I cut the resistor completely out, and taped over the bare part of the tan wire. I then taped the entire harness replacing what I had cut off. I used blue electrical tape. Why blue? First, because I can. And second, 25 years from now someone is going to be restoring this car, pull out that harness, look at the blue tape and say who the f* would do this? Somewhere I will be giggling.
Once again the forum teaches me something. Thank you!