I use a choke servo, and a throttle servo. I set one of the switches on my futaba 8u as a throttle kill. It works great and is better than having to back the throttle trim all the way down. There is a fiber optic kill switch, that's in line between the battery and the ign box which directly cuts power to the ign box. It's the trick way to go, but they cost about $70-80 bucks. One thing you can do with your 9C radio is use the slide switches on the side. One for ign kill, and the other for high / low idle, or for choke servo.