Component Tests and General Diagnostics

If the Oil Pressure Indicator stays "ON" with the Engine running:

^ Disconnect Fuel Pump/Oil Pressure Switch. If the indicator goes "OFF," replace Fuel Pump/Oil Pressure Switch. If the indicator stays "ON," 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 come "ON" before the Engine starts, and the bulb is good:

^ Measure the resistance from the Instrument Cluster connector terminal "D10" to ground. If the resistance is approximately 68 ohms, check CKT 31 between In-line Resistor and Fuel Pump/Oil Pressure Switch for an open.
^ Connect a fused jumper between Oil Pressure Switch connector terminal "A" and ground. If the indicator comes "ON," replace the Switch. If the indicator stays "OFF," check CKT 31 between Instrument Cluster and In-line Resistor for an open. Remove Instrument Cluster for service.