Gas gauge not working? I think I fixed it.

Pawned,

No offense taken. I do more than talk. Have more than 30 years of professional product design experience. My designs always work.

What I suggest has be done before by me, for other similar measurement systems, and likely by others. It may cost a few dollars more, but it will also calibrate the full end of scale. It will not fix wiring problems, or mechanical problems like float travel limitation, a broken sender or gauge. If the sender changes resistance with travel, and the gauge is able to swing from empty to full, with a variable voltage below gauge reference voltage, it should work.

Once the controller is programmed, it is just a part, so others need not worry about that. The calibration means, will use a couple switches, so the unit can be re-calibrated again, if moved to a different car, or sender or gauge changed. No pot to drift or adjust.

I will start a new thread called "Gas gauge calibration unit". I am tied up by grandchildren at the moment, so it might take a day or two get things started.