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The coolant-temperature (left) and oil-pressure (right) sending units are variable resistors that are sensitive to temperature and pressure. The hotter the coolants get or the higher the oil pressure becomes, the lower the resistance to ground, which means more power across the gauge. At full power, the needle moves to maximum. When the engine is cold or the oil pressure is low, resistance to ground is high and the needle remains at the far left.
Instrument Panel Function & Electrical Basics

 The coolant-temperature (left) and oil-pressure (right) sending units are variable resistors that are sensitive to temperature and pressure. The hotter the coolants get or the higher the oil pressure becomes, the lower the resistance to ground, which means more power across the gauge. At full power, the needle moves to maximum. When the engine is cold or the oil pressure is low, resistance to ground is high and the needle remains at the far left.  View Related Article

 

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