gauge

I'm replacing my meter panel and trying to figure out the gauge function. The fuel sender is a variable resistor. The coolant temperature sender is a thermistor which measures 4700 ohms at 68 degrees (warm today.) A galvanometer type gauge normally has two terminals, is polarity sensitive...

Our Massey Ferguson 165 tractor's fuel gauge has never worked. The fuel gauge was bad but I was able to order a new one (p/n: 1074336M9) for $20 here...