Drilling holes in your boat is fun! Lesman, I already bought the right size holesaw and can help you put it in if you go for it. Even if you decided you didn't like it anymore, the paddle wheel comes with a special plug that fills the hole if you pull the paddle wheel out. There is even a really cool clamshell type assembly inside the hull fitting that closes when you pull the speedo out from the top, so you could do it in the water if you were brave.
It is amazing, anybody who wakeboards needs it. I improved a bunch in the last couple of weeks of the season, just from getting a perfect pull.