Component Tests and General Diagnostics

If the Oil Pressure Indicator goes to "LOW" with the Engine running:

^ Disconnect Fuel Pump/Oil Pressure Switch. If the indicator goes normal, replace Fuel Pump/Oil Pressure Switch. If the indicator stays "LOW," check CKT 31 for short to ground.
^ Inspect the Instrument Cluster printed circuit for a short. Also check that the printed circuit is mating properly with its connectors and not shorted there.

If the Oil Pressure Indicator does not go to "LOW" before the Engine starts:

^ Measure the resistance from the Fuel Pump/Oil Pressure Switch to ground. If the resistance is approximately 1 ohm, check CKT 31 for an open.
^ Connect a fused jumper between Oil Pressure Switch connector and ground. If the indicator goes to "LOW," replace the Switch. If the indicator stays at normal, remove Instrument Cluster for service.