Gas gauge calibration unit

Thanks, Kit. At some point in my career as a broadcast radio engineer someone told me that I was educated beyond my understanding. I think that applies here as well!
All I really want is a fuel gauge that shows "empty" just a little before the tank truly is empty.

I can handle addition, subtraction, multiplication and division but spreadsheets and formulas baffle me. With a multimeter and a schematic and I'm pretty darn good (if I say so myself) and that satisfies me.
Getting my hands dirty and tracking down and correcting the electrical and/or mechanical failures is much more satisfying than wrestling with theory.

BC