I know that the oil pressure gauge is a fake and is in reality just an analog idiot light, but how can it still read normal oil pressure with the sender unit wire disconnected from the sender unit? If the sender unit grounds the wire with normal a oil pressure condition, then a disconnected sender unit will not ground and shouldn't the "gauge" then read zero oil pressure? Mine is totally unaffected by disconnecting the sender wire, still reads the same normal prss. with or with out the sender unit were attached. Thanks, Mike
97 oil press. gauge
May 31, 2004
3 Replies
The sending unit connects the wire to ground when the pressure is below it's setting (< 10 psi I believe), so disconnected is the same as connected if the engine's running. Ground the wire and the gauge reading should be zero.
Sure you would, if the sender failed (I.e. failed to detect oil pressure and open the switch), or if the wiring circuit opened, you'd see "oil pressure" with the key on/engine off...
-cliff-
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