Fuel Gage Accuracy

Hi All,

Newbie here trying to get the fuel gage on my step son's 1990 cherokee to give an accurate reading. It has a new tank, pump and sending unit but runs empty somewhere between 1/4 and 1/2 on the gage.
Using the "fill at xxx amount of miles" method right now but I really want the gage to be somewhat accurate if at all possible.

Any help would be greatly appreciated!

Establish a good ground for it and it will probably read correctly