There was another racer running the smc in the 1/12 genX.
Booster I was using is the one from HobbyKing -
everything worked really nice, had full servo speed and transponder power for the full 8 minutes.
With the tekin RS, you have to wire in another mini switch off the + and - on the esc into the booster and than the booster into the reciever. Long story short you are suppling the reciever with 5v, and anything else down stream from there, ie servo and transponder. With the tekin you leave the speedo switch off and tuck it away somewhere. Also used the 189 software/profile.
I was a little sketptial at first about all this, and it sounds like a big hastle, but it is really not that bad, and worked really nicely.
I have some pics to post if anyone is interested, just dont make fun of my wiring "jungle"... lol
hope this helps.