Somerset Regal L4-151 2.5L (1985)
Oil Pressure Gauge: Component Tests and General Diagnostics
Engine Sensors - VIN L
Engine Sensors - VIN U
1. If the gauge reads high with the engine off, remove the connector from the oil pressure switch/sender and ground terminal B (TAN/BLK).
a.
If the gauge now reads high with the engine off, install a new oil pressure switch/sender.
b.
If the gauge still reads high, locate and repair the open in the TAN/BLK(231) wire between the sender and the cluster.