By the way, since you are new to ignition engines, you should be aware that you can not comingle any components of the RC system with the ignition system. I know things are cramped in a 20cc planes but it is something that should be avoided as much as possible. This is particularly important around the receiver and its antennas, so be careful with your installation. Below is a quote from the Futaba website. We have to assume that if anyone knows what they are talking about they do. Dan

“Guidelines for setting up gasoline engine models.
All ignition equipment, including an electronic kill switch, must be mounted at least 12", and preferably 14", away from all radio equipment, including throttle servos, etc. Ignition kill switch should always be on opposite side of fuselage from radio kill switch. All pushrods going to anything related to the engine must be non-conductive (just nonmetal clevises is not sufficient).”