I can't remember, is the 7th channell on that radio proportional or not? If it is there should be some way to slave it to the elevator. The only Y you would need then might be for the batt(If the rec only has 7 slots). It may be that you would need a PCM reciever for this. Have never needed all of my 9C's channels so I can't recall. Regardless, even if you had the room I would not reccomend putting the servo arms one up and one down. This may work well on a sport model with moderate throws, but on a plane setup for 3-D you could see quite a difference in throws between elevator halves, especially at the end of the travel.