Oil Pressure Gauge Test
- Disconnect oil pressure gauge sending unit connector. Oil pressure gauge sending unit connector is located on right side of engine, behind alternator. Connect one lead of Gauge System Tester (Rotunda 021-00038) to Yellow/Red wire of oil pressure gauge sending unit connector and other lead to ground.
- Set tester to resistance values. See TESTING OIL PRESSURE GAUGE illustration.
- Turn ignition on (engine not running). Ensure needle indicator displays correct values. Continue inspection for 2 minutes on each setting to correctly judge condition of oil pressure gauge. Allowable error is twice width of gauge needle.
- If oil pressure gauge reads correctly, replace oil pressure gauge sending unit. If oil pressure gauge does not read correctly, replace oil pressure gauge.
Courtesy of FORD MOTOR CO.