No electric to fuel gauge or fuel pump

The wire is grounded for the sending unit causing gauge to read full all the time. It may be the fuel pump balance module is bad or maybe a fuse check all fuses under hood fuse box then scan for codes. Also if truck won't start with your key try a different one if you have one. It may be a security issue especially if you disconnected battery. Also check fuses in car

The pump and gauge are on two different wires. There is a pump and sending unit in the tank. The relay for the gauge is on the fp module which is on lh side of frame rail probably near the tank. You need a scanner to see if it works or not but a pro has to check this. Also some of those years had bad connections at pump and about a foot of harness with a different connector had to be put on when pump was changed. A pro should really check this so he can scan the pump module to see if it's the culprit otherwise you are shooting in the dark and may waste money on parts that are not needed.