Oil Pressure Gauge: Description and Operation

The oil pressure sender/switch, with a resistance from 0 to 90 ohms, sends a signal to the cluster that is related to oil pressure. At zero pressure (0 psi), resistance is 0 ohms, and at maximum pressure (80 psi), resistance is approximately 90 ohms. This signal is supplied to the cluster through the TAN(31) wire. If the engine oil pressure drops below 10 psi, a box around the oil pressure gauge ISO symbol flashes to indicate low oil pressure.