How did you do that without cooking the wire entry?
I did mine rather "redneck" but I "effed up" I put in a 1/4" istead of larger. At the time this was for vapor return
Punch don't drill a hole in the drained tank. Use a taperd awl and swedge/ enlarge the hole. This creates lips on the hole to reinforce
Fill it full of nitrogen/ CO2 through the vent or fuel line
......And braze it in.........
