Gas gauge problems

There really isn't much to it. I see a ton of people having issues with their fuel senders, and I guess I don't see why. There isn't much to the system. As long as you are getting the proper voltage to the gauge (That is an issue for many). I bought a variable DC power supply that I can calibrate with my volt meter to test the gauge itself (using a variety of resistors). Then confirm the sender is properly grounded. After that, it all comes down to resistance of the sweeper on the fuel level arm.

Don't get me wrong,... if the aftermarket ones have the wrong resistance range,... that is going to mess with you! I had to add a 10ohm resistor to my temp gauge in my Chev C10 because the resistance of the sender was off when at normal operating temp. I confirmed temp with a calibrated IR thermometer, then added the extra resistor. Needle runs right where it should now. If I see it spike up or down, I will know I have a problem.

I don't worry too much about accuracy of the fuel gauge as I consider it a reference only. Except at the bottom. I need to know when I am going to run out. I don't know about other models, but on my Charger gauge, you can adjust the needles. I set mine so 75 ohms sets me just below empty. I will tweak it a bit once I get everything installed and see what the resistance of the sender is with the float arm all the way down.