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Home >> GMC >> 1997 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing & Diagnosis >> Oil Pressure Gauge >> Gauge Always Indicates High Oil Pressure

Gauge Always Indicates High Oil Pressure

  1. Disconnect fuel pump/oil pressure switch/sender connector. Turn ignition on. Connect fused jumper wire between Tan wire at fuel pump/oil pressure switch/sender connector and ground.
  2. If oil pressure gauge indicates low pressure or indicator lights, replace fuel pump/oil pressure switch/sender. If oil pressure gauge indicates high pressure or indicator does not light, locate and repair open circuit in Tan wire between fuel pump/oil pressure switch/sender connector and instrument cluster connector. If wire is okay, replace instrument cluster.