Also if your tank has mounting straps that do not have any insulation between the tank and the strap that will ground the tank.
Adding a dedicated ground from the tank to the body can't hurt.
The full path is:
- Sender
- Lock ring
- Gas tank
- Strap
- Body
With the strap at Murray noted:
- Sender
- Fuel line on sender
- Spring steel strap that straddles the rubber hose
- Fuel line on body
- Metal clips that mount the fuel line to the body
- Body