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Location: Truckee, CA
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Re: Oil pressure sending unit
Assuming it is an electrical gauge the sending unit probably has a variable resistor that sends current to the gauge. Although all the electrical gauges I have used read zero with the engine off maybe yours is designed to operate that way?
If your sending unit has two wires coming out of it you might try reversing them? I have never seen one with two wires, but who knows?
Edit: Actually, IIRC, the sender sends ground to the gauge in varying amounts with battery on the other side of the gauge.
Last edited by dabnis; 08-15-2013 at 03:49 PM.