Auto Meter Fuel Gauge in 69 Charger

There is a lot of misinformation and amateur fixes out there for fuel gage issues. Trying to get 50 year old parts and wiring working correctly is a challenge even if you have the right ones.

One of the biggest issues with getting the gauge to read correctly is the shape of the fuel tank. If you look at it closely, you will notice that the top part has a big section of it cut out to clear the spare tire. This means that the top half of the tank holds much less gas than the bottom half of the tank.

This means that the tank level will drop really fast on the top half because there is only a few gallons of gas up there. It will drop slower on the bottom half of the tank because that is where most of the gas is.

So if you you have a “linear” sender (one made for a tank that is a “box” (doesn’t have the spare cutout), it won’t work right because it is measuring only the level of the gas in the tank, not how much is gas is left in the tank.

No amount of bending float arms or repositioning senders will solve this issue.

In a non linear sender, the resistance only changes a little at the top or the tank because there is only a little gas up there. It changes a lot at the bottom of the tank because there is a lot of gas down there.

Once you understand this part, it will be easier to problem solve to get everything working properly.

This is the problem the meter match solves.