The new 58 apache at our house has an issue with fuel gauge. It reads 1/4 tank when the tank is full and needle disappears past empty when half tank left. Yes I cleaned terminals on gauge and connectors and the ground wire on fast and terminal and where it grounds to body. Should I just buy new sending unit or is there an adjustment I can make on the current sending unit. Yes the whole truck is original or after market like original parts. Thank you
