If the new tank sender is actually a variable resistance, then you should be able to verify that, simply, with a meter. You only have three possibilities----or or the other wire to ground, or between the two wires. If it is a resistor, which wire you ground should make no difference.
It is possible that it is NOT a resistive sender, I am not familiar with what else is out there for sensors
You have two issues if it's a resistor--one is the resistance range, and the second is the fact that original Mopar senders are not linear--reread what Dana posted for the values and you can see that.
There is an aftermarket product called "meter match" and at least one "copy" on egag and they scale non linear/ other/ innaccurate senders to match the desired meter reading
