Why is my fuel gauge not reading?

The fuel gauge gets its information via wiring from the fuel pump sending units. If there is a wiring concern or a concern with one or both fuel sending unit (more than one fuel tank if equipped), then the gauge will read erratically. Does your truck have a fuel tank switch - so you can go between multiple tanks? If so, switch to the other tank and see if the gauge reads differently. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops