Fuel sending units read WRONG time after time!

71 duster v318

My voltage regulator puts out 4.975 volts. I did not overheat it. I use heat sinks when I solder semiconductors.

The gas gauge uses a float that moves up and down a wrapped wire resistor. if you look at the schematics the gauge is in series in the circuit. That is how a ammeter is hooked up, the Temp gauge is also hooked up in series like a ammeter.
The bi-metal is just how it moves the needle.

if it was a volt meter it would be hooked up in parallel to the circuit.

I went to school a very long time, long time ago. I am sure the laws of electricity have not changed since 1971.