Gas gauge not working? I think I fixed it.

skykeith said
There are fuel quantity systems that use a variable power source to calibrate the gauge the same way you have done. Search Google for Texas Instruments LM317KCT data sheet. There is a lot of info on it showing how to make a simple and cheap variable power source. Most systems are impossible to calibrate on their full range, so most of them, especially on airplanes, are calibrated to read correctly at empty and not worry about the readings at full (the only time you can have too much fuel, is if you're on fire.)
Until someone makes a plug in system with a microcontroller and a stepper motor indicator, you may only get one point at which the gauge reads correctly.

Most correct. Unfortunately, my tank was not empty so I could not check it. But on the test bench, the gauge read empty when I had 6vdc on it and the variable resistor set at 9.6volts which is factory spec. But I do know for sure, that the gas gauge reached full just as the gas overflowed the tank
I do plan to run the car out of gas to see where it sets. Means I have to refill the gas can in the trunk.

Because of the low amperage regulator I put in, I just purchased 2 of these variable voltage regulator off of ebay. http://tinyurl.com/n84sy3h . For $1.15 how can you go wrong. So when the time comes to open it up again I will put them in.
I will modify them slightly. If you look at my gauges pix, you will see a small hole and recessed screw head below the gas gauge. That is a variable resistor that I was using for test. It is no longer hooked up, but when I use the board, I will remove the blue resistor and hook mine into the circuit. This way I should be able to adjust the voltage without pulling the cluster.