I am having the same problem. I installed the new 12v. guage into the cluster and now I am getting about 6v. at the sender. If I remember right there should be no voltage at the tank. I also have a new sender in the tank but have not hooked it up yet. I am getting all of my readings at the wire at the tank. Don't want to burn up the sender. Anyone have any ideas whats going on?

1953 Chevolet 5 window