aftermarket fuel gauge

Any aftermarket gage that works with a 10 to 74 ohm range sender will work for you. That is the approximate resistance range of a stock mopar fuel sender. 10 is full, 74 is empty. Those numbers don’t need to be exact, just close. Like 8-80 or 12-70 or something like that.

The nonlinear part is in the sender and is based on the shape of the tank. Doesn’t affect the gage choice. If you have an OEM style fuel sender, your aftermarket gage will work good. If you have a linear aftermarket sender, your gage will work crappy, just like a stock one.

There are a lot of threads on here about aftermarket fuel senders that may help you understand the issues, but are not necessary to just replace a gage. If you need more help, just ask.