I have the original gauge but it has an aftermarket sender. When I bought another aftermarket one to replace the non functioning one it was too small to fit in the tank, meaning the tank opening was too large. I may have an incorrect tank. The new one ohm'd out at 240 ohms and the gauge worked/ but didn't fit in the tank, the one that fits the tank is only 90 ohms and the gauge always reads full unless I disconnect the sending wire then it goes to empty. Did the 56 Vicky have a sender that clamped down with a ring or was it held down with 6 screws? Thanks!