[Formulajones]

This ^^^

I recently went through this on a Chevrolet and found the sending unit testing correctly. This particular model does have the resistor on the back of the gauge as Tekuhn mentioned. They come in various resistance levels and are usually color coded. Changing this resistance will dial in where the gauge reads.

The problem is though that I could never find a place that was reproducing these little color coded shunt resistors as Tekuhn calls them.

What I've thought about doing is installing an adjustable or variable resistor or potentiometer that will allow me to dial in the temp setting to match the actual engine temperature. Easy to wire in.