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I'm also getting ready to purchase a Raymarine ST40 Bidata and need to install the paddle wheel speed sensor in an existing through-hull that is currently plugged. The old paddlewheel has been laying in the bottom of the hull next to it since I bought the boat. I was wondering if I can quickly pull the plug that is threaded into the thru-hull and replace the new one? Or... will I have too much water pressure coming in, to install the new one?