Non-F-body Help needed. GM Wiring.

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
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Joe: me amigo, my buddy, my pal. Here I disagree.. The 4.3 Chevy V6 is a better engine then the buick or chevy 3.8. Not only does it have the same bore and stroke as a Chevy 350. It also shares internials. V6 wises it's the bullet 'proof" GM V6 (V-sick).
A 4.3 V6 can also be bored and storked to a streetable 305 CID!
Yet if I had a 80 Ely body... I would drop my 383 in it, and have a G body that hauled ass, and nothing but ass. Charles lude & crude the way I should be
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4.3 vin Z, 3.8 229 vin K or 9 Chevy, all of the same genre. All oil burning clacking "rough" engines. Chevy makes the "loosest" engines of all the divisions (and the most "troublesome").
Fortunately, most of the problems are easily fixed.
Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....
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Well, nevermind. I got it all figured out and fired up.
Bird79 1979 Firebird Esprit 1973 455 YC
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