My fresh water gauge in the Audit system had failed and the only access was behind the WH.
I had to remove WH to repair a PEX fitting so I was able to fix gauge.
The sensor is a wire GOBBERED onto the Aluminum tape with a gob of glue. I reset the wire ends and covered them with more aluminum tape and while I was at it did the same with the black and grey sensors, they work again and I hope that this is the last time in my lifetime that I have to remove a WH.
On ours, the wires are soldered to small patches of copper foil which are glued to the aluminum foil. Same technology as the old burglar alarm sensors, I guess.