Hi mate I have the hobbywing xtream stock. I think they are the same speedo.
If you have a look on utube there is a tutorial for the xtream stock. The main thing to watch for is all ways flash any up dates or soft ware twice into the program box as well as your speedo.
hears the links.
Part 1 ------>
http://www.youtube.com/watch?v=bUKMoGvRJZY
Part 2 ------>
http://www.youtube.com/watch?v=iOCFkCwBlrQ
this man knows what he's talking about.
There's a good source of info on set up's on this site.
http://www.rctech.net/forum/electric...ings-only.html
hope this helps.