A hole saw for the paddle wheel.
Check with PP about location of the paddle wheel for your hull, they should give you the best placement for your type of boat.
Lots of zip ties for the wiring, the little ones help make a nice neat install.
The servo motor/mechanism looks like it installs backwards (in the push/pull sense) from what you think but once you see it in action it all makes sense.
Lastly, measure twice drill once
You'll love the PP, it makes a world of difference. My wife really loves it.