1998 3800SC into a 1987 Fiero GT- Been looking over the GMTuner wiring harness chart. "Where" is the PIN for the Oil Pressure gauge ?? Did I look and not SEE it ? thanks
Your oil pressure sender tan wire (B) connects to C-203 E. That runs the gage. Orange/black (A) is conncted to Fuel Pump relay D. Tan/white (C) is connected to C-203 L
There is info on the Sinister Performance website that shows the C-203 and C-500 wiring as well as an Electrical Interface chart. The info on the site is invaluable to anyone performing a swap at home, but it is also a really good idea to have a Factory Service Manual available so that any questions that arise while building the harness can be researched and answered. That way there is a good understanding of every circuit in the finished vehicle. Glad to help you out!