Ok, I know this is way off vehicle, but this is seems to be one of the more knowledgeable groups I visit. Im putting a 4.3 liter, computer and all, out of a 91 blazer into a 1980 GMC Caballero (el camino). I have almost all the wiring figured out with the exception of wiring the oil pressure light system. The original engine (3.8L chevy) had the two prong/three wire switch. Two wires ran to one prong, one of which ran to the choke. This leads me to believe that the other wire ran to the idiot light on the dash. The wire on the other prong must then be an accessory power 12v source. Problem is I tested both wires running into the car with both the ignition on and off and both form a closed loop. I know some chokes had a relay, but not sure how it was wired in. Can anyone shed some new light on the situation. I must be missing something.
Bird79
1979 Firebird Esprit 1973 455 YC