Assuming you are buying the correct sender. Assuming you are not buying a sender for an idiot light: The gauge is grounded by it's metal frame to the gauge cluster by contact and thru screws. These spots need to be clean shinny metal. Then there needs to be a dedicated ground wire or two to the gauge cluster rear plate mounting screws. This ground wire(s) must then be attached to dash or other good shiny place. The entire cab needs to be grounded to battery at the passenger side firewall stock grounding location (as Bill said) and that needs to be cleaned and wire brushed shiny also. The engine block, which the sender is screwed into, needs to be grounded to battery also. It is always advisable to be sure all the stuff works on the bench, FOR SURE, at several temp ranges before installing. That way you know the components are good and can concentrate on the wiring. This stuff is a real headache unless approached correctly from the beginning. Take off all the grounds and re-clean/sand/brush them as the next step and to help in future electrical part installations. Sensor is a TS-6. Parking brake? That beats the guy on here who has to turn on his blinkers to start his truck! As Bill58 says; you are creating a needed good ground...or are bending a wire in the right direction!?!?!?
