misreading temp gauge

1968FormulaS340 said

Not exactly.....

The gauges are not 12v. They are 5v in a 12v system. The IVR (Instrument Voltage Regulator) cycles the 12v to feed the fuel gauge an "average" of 5v.

The fuel gauge feeds the other gauges.

....Or al least that's how I understand it.

Click to expand...

This might be a tiny bit misleading. The IVR is IN the fuel gauge HOUSING in some clusters. The output of the IVR feeds the other gauges FROM the fuel gauge HOUSING IN an early dash cluster OR IN a RALLY cluster


So, electrically, 12V feeds TO the IVR, which (orginially) "pulsed" the 12V into a "fake" 5-6V. This IVR output then branches off and electrically feeds the other gauges.