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Examining the wiring schematic, we learn all of the gauges (except ammeter) get their power from the ignition switch. Power from the ignition switch travels to the voltage limiter, which steps the voltage down to 5 volts for the gauges. Power travels through the gauges to the sending units, which control the flow of electricity to ground.
Instrument Panel Function & Electrical Basics

 Examining the wiring schematic, we learn all of the gauges (except ammeter) get their power from the ignition switch. Power from the ignition switch travels to the voltage limiter, which steps the voltage down to 5 volts for the gauges. Power travels through the gauges to the sending units, which control the flow of electricity to ground.  View Related Article

 

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