Temperature & Oil Pressure Gauges

The temperature and oil pressure gauges operate on the constant voltage principle through a voltage limiter. The temperature and oil pressure indicating systems are identical in operation as that of the fuel system, with the exception of the method of varying resistance of sending unit.

For the temperature gauge, the resistance of the disc in sending unit varies with a direct relation to coolant temperature. When coolant temperatures are high, resistance is low. When coolant temperatures are low, resistance is high.

For the oil pressure gauge, the sending unit resistance is controlled by a diaphragm. The diaphragm is actuated as oil pressure increases or decreases.