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Where is the fuel pump switch and engine oil pressure gauge sensor located on a 1994 GMC sierra SLE 1500 5.7 liter located?

Fuel Pump Switch

The fuel pump switch is located on the driver's side of the vehicle, behind the access panel in the rear of the cab.

Engine Oil Pressure Gauge Sensor

The engine oil pressure gauge sensor is located on the driver's side of the engine, near the top of the oil filter.