thats the kind of speedo we used on the big boats, if the thru hull was sealed, then the plugs is usually good to go. I'd pull that thing out(everyone uses gps for speed now), and use that hole for a thru hull transducer. BTW, I'd start stripping the bottom paint now, you've got a big job ahead looking at how many layers are on the bottom. Get some paint stripper, some chip brushes to spread it out, drop tarps to catch the crap and a scraper with a long handle. Don't forget gloves
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