After the addition of the ground strap, my fuel gauge still isn't working properly. On a full tank, it now only reads 3/4 full instead of the 1/2 full without the ground strap. Anyways, I have a new sending unit waiting to go in. Does anyone know if this can be changed without pulling the tank? The car will be on a lift tonight, and I'd love to change it without pulling the tank. 68RR btw.

Thanks.