1996 Ford F-150/F-250/F-350/Bronco Oil Pressure Gauge & Switch Operation

This page is from Section 13-01 (Instrument Cluster, Conventional) of the 1996 Ford F-150, F-250, F-350, Bronco, and F-Super Duty Motorhome Chassis Workshop Manual, in the Description and Operation subsection. It explains the Oil Pressure Indication System, which consists of an oil pressure gauge and an oil pressure switch. The gauge is described as a magnetic movement design with a bobbin/coil assembly, a return-to-zero magnet, and a primary magnet to which the shaft and pointer are attached; the bobbin/coil assembly presses into a metal housing with two dial-mounting holes. Operation is via a pressure-activated switch: when the engine starts, oil pressure closes the switch, grounding the gauge coil circuit, and current flow rotates the primary magnet and pointer to display an oil pressure reading. The document states the gauge requires no adjustment, calibration, or maintenance, and warns never to remove the pointer indicator from its shaft. The oil pressure switch closes under normal operating conditions (oil pressure above 42 kPa / 6 lb/sq in) and opens with the engine (base part 6007) off with no oil pressure. Readers learn how the factory oil pressure gauge and switch function and the pressure threshold at which the switch closes.