Sorry for the delayed response. Damned day job! OK. So, the next move is, as I mentioned above: Assign POTI 4 to either Servo 3, 4 or 5 on the FC board, and run a cable from whichever you choose to the Tilt Radian port 2. Then test (using the Radian software connected to the tilt Radian that you have Mode control when you operate the switch). Just focus on that aspect first. Be very careful about getting the correct connector on the FC board. And double check in MK Tool that when you operate the switch that you're seeing channel 8 changing and that you have assigned channel 8 to POTI4. Andy.