Section 13-01: Instrument Cluster, Conventional | 1996 F-150, F-250, F-350, Bronco, F-Super Duty Motorhome Chassis Workshop Manual |
The oil pressure indication system consists of an oil pressure gauge and an oil pressure switch.
Oil Pressure Gauge
The oil pressure gauge is a magnetic movement design consisting of a bobbin/coil assembly, a return to zero magnet and a primary magnet. The shaft and pointer are connected to the primary magnet. The bobbin/coil assembly is pressed into a metal housing which has two holes for dial mounting.
The gauge operates through a pressure activated switch. When the engine is started engine oil pressure closes the switch, providing a ground circuit for the gauge coil. Current flow through the gauge coil to ground causes the primary magnet and pointer to rotate, providing an oil pressure reading on the dial face.
The oil pressure gauge does not require adjustment, calibration or maintenance. Also, never remove the pointer indicator from its shaft.
Oil Pressure Switch
The oil pressure switch controls the magnetic oil pressure gauge's pointer position. The oil pressure switch closes under normal engine operating conditions (oil pressure above 42 kPa [6 lb/sq in]). The oil pressure switch opens with the engine (6007) off and no oil pressure.