I knew there must be a reason why everyone doesn't use Capacitive Senders. They are quite difficult to install. About 2 hours last night and I was able to get them in and get the signal wire wrapped around the vent tube. Also confirmed with the multi-meter that there is no resistance in line between senders and between the BNC signal, also that the sender assembly is not grounded to the tank in any way.
It turned out OK, but Required more torqing on the wire terminals than I would have liked. I still need to dab a bit of sealant on the wire as it twists around the vent tube, and a few more final checks before closure, then hopefully this will last several years as I don't want to be opening up these tanks again soon...
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