Sending unit issue

Look at post 4

Product Review: A100 Fuel Sender For 67 Dart

The problem with ALL aftermarket senders is they are linear but the tank and the gauge are not.
Wow that’s the problem I have it’s reading over full. And I don’t have the original one since it was rusted to pieces. So how would I correct this? Should I find another one or can I make this one work?