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Oil Pressure Gauge & Harness Operational Test

  1. Unplug oil sending unit connector on engine. Turn ignition switch to ON position. Oil gauge should indicate LOW. Turn ignition switch to OFF position. Connect a 12-volt, 3.4-watt test light between oil sending unit harness connector terminal and ground.
  2. Turn ignition switch to ON position. Test light should glow and oil pressure gauge should slowly move to HIGH. If gauge functions as specified, LOW OIL PRESSURE SWITCH TEST . If gauge does not function as specified, perform OIL PRESSURE GAUGE RESISTANCE TEST below.
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