I had this discussion with my autoshop teacher when I was 16.. as both my Monte Carlo and trans am oil gauge bounced like mad and sat at 0 at every stop, and no other car (outside of gm did this) he said its the way gm measures it, if the pressure really fluctuated that much there would be a problem. I dont think the fords is an on off gauge.. and maybe its not sensitive enough to read 3 psi variations. But at idle.. it not sitting on the zero pressure peg
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