Leave the ignition off, then put the needle on pointing at zero. Once you do that, turn the ignition on, but don't start the engine. If the gauge is still pointing at zero you are done. If not, move the needle and repoint to zero. The final step is cranking up the engine with a second (mechanical) oil pressure gauge attached to a T where the electric sending unit is. Compare readings. The mechanical gauge is probably right.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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