Instrument Panel Function & Electrical Basics
Like the fuel and coolant-temperature gauges, the oil-pressure gauge works via a variable resistor—the oil pressure sending unit. When pressure is low or zero, resistance to ground via the sender is high, which keeps current flow across the gauge low. The needle remains at rest. When oil pressure loads the sender’s diaphragm and variable resistor, resistance falls and current flow across the gauge to ground increases. The needle moves to the right. This is a sender for an oil-pressure light, which is smaller than the sending unit for a gauge.
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