I installed one of these units on my 660 Raptor but have a few questions concerning the WR. First, has anyone used the stock speed sensor wire from the WR for the Vapor? Splice them together behind the headlight or something. I would assume the stock unit is a pulse driven system and so is the Vapor. Second, What is the unused 4 wire square plug from the stock computer for? Just curious. Lastly, Any reccomendations on mounting? Should I use one of the Trailtech units, stock mounting location, or make my own bracket? Any input would be great.