Fuel Sending Unit Ground Location?

[ptrckdillard]

Hello all,

Wondering if someone could help me out with this. I purchased an took over a friend's project. 1972 C-10. The previous owner had already mounted a new aluminum bed mount fuel tank. The sending unit which is already installed does not have a separate mounting point for the ground. My questions are:

1. Does it need a ground or is the tank bolted to the frame the "ground".
2. Should I install a ground wire beneath one of the 5 bolts on top of the sending unit as seen in the pic?
or
3. Should I put the ground on the same mounting point as the sending unit wire beneath it.

Thanks in advance for any help.