"It simply reads the voltage generated from the small generator inside it that the cable is driving."
A small generator inside the speedometer?????? Wha?????
My fuel gauge measures total fuel weight, and density relative to the barometric pressure for the day. It then factors in the coreolas effect as the fuel empties down the fuel line and calculates the remaining fuel in the tank which it posts to my old analog gauge.
Sorry, I had to do it!
Ed