Hello everyone. I started Mum'* '83 Buick LeSabre and I noticed the oil pressure light did not light at key on. The car has not been started in a year; the last time it was started the light was working; I always do the lights check at key on. I checked the bulb by applying 12 volts and the bulb is good. I suspect the oil sending switch and have ordered a new one. I noticed this is a two prong/spade oil pressure switch and there are three wires going to the connector. I first thought that the switch does not ground to the block like a one spade connector but then rethought this; running a ground wire to the switch does not make sense. I looked on the net but can not find any information on the wiring for the pressure switch. So I came to the forum to ask if anyone knows the wiring diagramme for a 1983 Buick LeSabre oil pressure switch?

I have searched high and low on the net and I am turning up nothing, not a single wiring diagramme for this 83 Buick LeSabre. Is there some archive I can purchase wiring diagrammes?