Test K: Oil Pressure Gage Accuracy Test

Disconnect the Fuel Pump/Oil Pressure Sender/Switch. Connect one red clip of the J33431 tester (or equivalent) to the harness connector, TAN (31) wire, and connect the other red clip lead to ground. Set the resistance dials of the sender to 0 ohms and then to 90 ohms. The Oil Pressure Gage should show low pressure and then show high pressure.

^ If the Oil Pressure Gage operates correctly and the actual Oil Pressure is normal, replace the Fuel Pump/Oil Pressure Sender/Switch.
^ If the gage does not operate correctly, check the TAN (31) wire. If wire is OK, replace the Instrument Cluster.