Kirk
All of what has been said before is probably good advice. I would echo the sentiment that you need to plan your installation with as much separation of ignition components and on board radio components. I almost lost a plane once because on the maiden I had the charge wire from the ignition switch dangling inside the airplane, and it came close to things like the smoke pump, batteries, etc.. I would recommend you not only plan your installation in advance, but if possible run range - checks engine on and engine off, before you finalize (read that cut holes in your fuselage) your swtich postions. I use a CH ignition on my AW Edge, and I had the spark plug lead replaced with a "Bosch" cap and lead. That made a HUGE difference. Also, anything that rattles metal to metal will cause a glitch, so do use things like loctiite on your clevis nuts and things. The bottom line is that every installation will be slightly different and only the range test (running and not running) will show whether it's safe to fly.
Sam