Gas gauge woes..

We could just remove the ground question... With a piece of wire attached to the senders tube, put a ring terminal on the other end of that wire, use a drill point hex head screw to attach it to the frame member pretty much right between the shock mounts and tank straps.
The factories little jumper clip was their typical cheap, quick assembly, way of doing things but chassis ground is available all around and there are better ways to get it.