Right to the gauge. The oil pressure "sender" is a varistor meaning a variable resistor and the ground side of your pressure gauge connects to this terminal. On your gauge there should be two, or three wires to connect. One is a light, (if present) the other a 12VDC that is active, (hot) with the ignition key on, and this third connection for the "sender" to connect to.
The part referred to as "sender" is actually/technically a "transducer" which means a device that changes pressure to a variable voltage output that varies by the amount of resistance in the monitored system. This resistance changes as input pressure changes and in this scenario, you see as gauge movement; less pressure, less gauge deflection, more pressure, more gauge deflection.
Edited by Codger - 13 May 2023 at 6:12am
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