I can give you some info on that gage. I'd have to check wiring and connections. You might try to use an analog gage in place of oil pressure sending unit, see if the reading is doing the same thing. My hearing is no good, don't know about the sound you are hearing?
The IPC displays the engine oil pressure as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 kPa (0 psi) or below if:
The PCM detects a malfunction in the engine oil pressure sensor circuit.
The IPC detects a loss of class 2 communications with the PCM.
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Wednesday, July 13th, 2011 AT 5:05 PM