Oil Pressure Gauge

A variable resistor is part of the Oil Pressure Sender/Fuel Pump Switch. With no oil pressure, the resistance of the variable resistor is approximately 1.0 ohm. At an oil pressure of 550 kPa (80 psi) the resistance of the variable resistor is approximately 88 ohms. The Oil Pressure Gage applies voltage through CKT 31 to the variable resistor in the Oil Pressure Sender/Fuel Pump Switch. As the resistance of the variable resistor increases, the Oil Pressure Gage senses a larger voltage drop across the variable resistor, indicating high oil pressure. As the resistance of the variable resistor decreases, the Oil Pressure Gage senses a smaller voltage drop across the variable resistor, indicating low oil pressure.