In most vehicles, the oil pressure sending unit completes the ground circuit for the light if the oil pressure falls below a preset limit, typically 10 psi.

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The oil pressure sending unit is designed to complete the ground circuit for the oil pressure warning light on the dashboard when the oil pressure in the engine falls below a certain threshold, typically around 10 psi, to alert the driver of low oil pressure conditions.

In Most Vehicles, the Oil Pressure Sending Unit Completes the Ground