The magnetometer and AOA probe are on the port wing. Tropical Tuba's pictures have been invaluable during the build and I copied his idea of using zip ties to mount the magnetometer on a small board the wing tip. It's relatively easy to snip and remove the GMU-11 should it need servicing. I ran the magnetometer interference test with MicroSun Landing / Wig-Wag and Nav / Strobe lights turned on and off in various combinations. Even this close the unit passed with minimum interference at the time the strobes are first turned on. Wiring for all three units done is with shielded cable and the various grounds are wires - not the shield braid.