I just drilled a hole in my bar and ran my cable through for the throttle. I relocated my wiring to my side covers with toggle switches and a push button for start... Yeah the first one I ordered was a piece of shit and I don't care what anyone says... if you have one like I had and got it working then you are the man!!!
however I purchased a second one http://www.demonscycle.com/Handlebar...-p2892214.html
Now this one took some work to mod it... but it works well!
It is for 1" bars but not 1" grips so it will require some sweat.
I used a hammer to knock the inner part of the outer sleeve out. I used a belt sander to sand the sh!t out of the inner spin piece. I finally got it to fit inside of my 1" grip. Sanded down the shaft rod that holds the rollers to fit in my grip as well. Drilled a hole in my grip and the spin piece - threaded the spin piece and used a set screw to hold my grip to the piece. I had to also bore out the hole for my bars but I have been riding with it and it works fine...