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Yep. A bench test would indicate which unit is in place. Perhaps some marking from the sending unit could tell something.

Not arguing here. Just want to guide the OP. I've only seen 60 or 120 psi sending units and gauges.

Yep. remove the oil pressure sending unit and screw in a mechanical oil pressure gauge. You can use one the should be mounted in the dash. They're available at auto parts stores, napa, etc... You can bench test your sending unit by hooking it up to an air compressor. Check my thread and the...