RAM 2500 Van V8-5.9L VIN Z (1997)
Oil Pressure Gauge: Description and Operation
System Operation
SYSTEM OPERATION
The oil pressure gauge gives an indication of the engine oil pressure. The combination oil pressure switch/sending unit contains a flexible
diaphragm and a variable resistor coil. The diaphragm moves in response to changes in the engine oil pressure, which changes the internal
electrical resistance of the sending unit.
The sending unit is installed in a threaded hole that penetrates an oil passage of the engine. High resistance on the gauge side of the sending unit
causes low oil pressure gauge readings. Low resistance on the gauge side of the sending unit causes high oil pressure gauge readings. Sending unit
resistance values are shown in a chart in Specifications.
