Fred and Ed , A suggestion ; Fred orders the new sender from Roberts , If the holes are in the " wrong " spots , he is in good shape . If the holes are in the " right " spots he trades senders with Ed who will now will have a correctly fitting sender also . Or do these senders have different electrical windings than the car versions ? In searching my foggy brain as to how I fitted my sender that the mounting holes were wrong , I remembered grinding the heads off one or two rivets , punching out the rivets , and turning the mounting position so the unit was about one hole off from being straight frount to back . Fast and easy .