I installed mine a "shoot thru the hull" Humminbird puck in wax. the wax is from a wax ring as used to seal a toilet onto a floor drain, available at any hardware store. I kneaded the wax well to soften it and remove air bubbles, put a blob of it against the hull and squished the puck into it. It worked well so I left it there that was about 4 years ago. it has worked fine since. This is a digital display model.
Pictured below with the floorboard lifted
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