There should be two wires connecting to your sending unit. One connecting to the center (and this one is your signal wire going back to your fuel gauge) and another connecting to one of the 5 screws holding your sending unit in place and from there to your cab (the ground wire). Do you have both of those? If you don't have the ground wire your gauge will register only intermittently in all likelihood.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
