I got tired of fooling with my other gas gauge set up so I bought a matched ohm set sending unit and gas gauge they are 240/full and 33 ohms empty and the brand is Autometer. The problem is the sending unit will only install one way and I have the float in the same direction as the old sending unit I had and the oem sending unit. The problem now is I have A FULL TANK OF GAS AND THE GAUGE IS READING 3/4 which I could live with if it meant when I got on empty I still had a quarter tank of gas.
I called Autometer tech service and they are insisting the float is hitting something and not letting it read to full capacity and I'm not convinced that's the problem.
I haven't tried the gauge test outside the fuel tank with the sender having 12 volts , seems unsafe to me to do that test and I don't want to take my gauge out.
Your help would be appreciated.
Thanks,
God Bless.

Claim to fame is the car was used as an extra in the movie Diner with Micky Rourke, Steve Gootenburg, Paul Riser and Kevin Bacon.