i bought it from a dealer, and they installed free(friend). but after seeing what all there was to it, as long as you dont get yourself worked up about drilling the hole for the paddlewheel, it is very straightforward.
just make sure when you order it, it is specified to PP that it is going on an I/O and the size of the engine.
I am also using the alternative officials display,that has the controls on it.(my speedo is behind plexiglass and out of reach. I have also seen people just make a bracket for one of the regular displays.
of course if you email pp, they will be able to provide you with the best answers.
http://www.perfectpass.com/pp_support_seriousskiers.html#Promo}