Oil Pressure Warning Lamp/Indicator: Description and Operation

The Oil Pressure Indicator goes on to warn of low oil pressure when the Fuel Pump Switch/Oil Pressure Switch is closed. The Fuel Pump Switch/Oil Pressure Switch is closed when oil pressure falls below 27 kPa (4 psi). When the engine is started, oil pressure is below 27 kPa so the Fuel Pump Switch/Oil Pressure Switch is closed, and the Oil Pressure Indicator goes on momentarily as a bulb test. The Oil Pressure Indicator goes off as soon as oil pressure is above 27 kPa (4 psi) and the Fuel Pump Switch/Oil Pressure Switch opens.