I can't find the oil pressure switch on my 1981 Cadillac 6.0. I'm thinking it's bad because the injectors won't fire but just for a few seconds.

The shop manual says it's threaded into the oil header gallery at the rear of the engine, if that helps.

Does it say what side of the engine?

All I can find is that it's a dark blue wire. This shop manual is great sometimes and others, I just don't understand why they skip so much.