new guy
Reply #3 –
There isn't one.
There is, however, a fusible link (one of the huge wires attached to the starter solenoid) that goes to one side of fuse #1 (which has nothing to do with the gauges), continues to the ignition switch, which sends power to the instrument cluster's internal voltage regulator, which powers the gauges (including temperature), which is then variably-grounded by the temp sensor on the engine.