Believe it or not the old one can be fixed, assuming it is not cracked or brittle, pull it out, it can easily disassembled, when it is apart, take a pencil eraser, rub both contacting parts with the eraser, slightly bend the contact arm inward so it makes better contact with the resistor board, reassemble, you should now feel more resistance with the sender, take an ohm meter to test it. I have done this on a bunch of trucks and they are still working. As for the senders itself, there should be no difference between gas and diesel. The only other thing is the float broke or dissolved, if that is the case, I used a float from a Holley carb and soldered it to the arm.
Last edited by dirtcrew51m; 08-07-2013 at 06:34 PM.