Oil Pressure Gauge
Remove oil pressure sender unit and temporarily attach a mechanical oil pressure gauge in its place. Operate engine to determine oil pressure. If engine oil pressure is normal, instrument cluster gauge should also indicate normal pressure. To test oil pressure gauge and IVR proceed as follows: Disconnect gauge lead from terminal at sender unit. Connect lead of a 1 2 volt test light or positive lead of a voltmeter (20 volt scale) to lead that was disconnected from sender unit. Connect other test lead to a good ground. With ignition on, a flashing light or fluctuating voltmeter indicates IVR is operating properly and gauge circuit is not interrupted.
If pulsating voltage is shown but gauge is not accurate, perform calibration test. If light stays on or voltage reading is steady replace IVR. If no voltage is indicated by voltmeter or test light, check for an open circuit in IVR, gauge windings, or printed circuit. Do not spark or ground either terminal of IVR. This could burn out dash wiring harness or IVR, or both.