Oil Pressure Gauge (1966-67)
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. If gauge does not indicate, momentarily short the oil pressure switch wire to ground.
NOTE:
Do not leave wire grounded longer than necessary to make test, as gauge may be damaged.
If gauge now indicates, sender is defective or not properly sealed to engine. Be sure to use an electrically conductive sealer (C3AZ-19554-B). If gauge does not indicate, then IVR, gauge or wiring is defective.