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19Fordy, I find your post a little odd. You are a pretty sharp mechanic, but from your post you say you have “a gut feeling it’s the pressure switch”. Seems like that could be verified easily enough, by jumping the switch as stated by others, or just put a test light to it.
I have a new Holley brand switch that I did not use. You can have it for cost of postage. Switch opens at 5 psi oil pressure.