magnetometer hole size
The magnetometer requires a 2.5" hole for mounting. I pre-installed the platform and established a midline reference. As you may be able to see, the ring is aligned parallel to the center line but slightly offset. The offset is of no consequence of course; wingtip location is an alternate consideration.
Paul all credit for a smoke free environment so far goes to Brent Fischer at SteinAir. He did the Garmin harness and tested the work to that point. I have since integrated his work with mine, connecting A/P servos, audio, power, trim position and a few misc. leads. Once I have the actual panel itself finished and installed we will see whether or not I have been able to maintain electrical integrity. I really have no doubts, the work has been quite straight forward.