During the recent Defender sale, I noticed they had a special on tank monitor I had not seen before from LIST. One and three tank systems with outside detectors. I don’t know anything about them personally, but was tempted (and resisted- not that hard to monitor by eye for my boat). Dave
https://www.defender.com/search.html?q=list+tank+monitor&x=0&y=0 S/V Aries 1990 C&C 34+ New London, CT
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