I recently replaced the gas tank and the sending unit. The old ground was completely shot(new one with the sending unit.) I cleaned up the surface of the old ground and installed the new one(it looked fine). However, my gas gauge still pegs past full. I even took the face off the cluster and pushed the peg to e and turned the key. It goes straight back to where it was. (its not full, its bout 1/3). Would this be a grounding issue or a hot wire issue?