I wanted a flap switch on my sticks, but I was told by Stein, who checked with Showplanes about the wiring, that it was a no go. I don't recall the exact reason, but it had something to do with the possibility of pilots giving conflicting inputs and how the micro controller would react. I guess with the Ray Allen trim motors, which I have on my grips with a hat switch, conflicting inputs simply cancel out since that is routed to a relay and not the motor directly. But since the Showplanes controller would directly connect to the switch on the grips, Stein said I couldn't do it. They actually arranged with Tosten for me to send the grips back to swap that switch for another button, and then changed the harness design a little to add another button functionality.
So, all I have is a double throw switch on the panel - momentary down (to signal each flap position), and latching up (flap motor runs until it stops).
For position, Stein included a wire in the harness for a sensor. The Showplanes system doesn't have position sense, but Stein offers a sensor that I will install the next time I'm doing major work. It's called a POS-12. The G3x is programmed already to display position (but it is X'ed out for now). Until I install that, my position sensor is the Mark I eyeball out the window.
I ordered the RV-10 retrofit motor maybe 6 months ago to replace the showplanes motor and add a position sensor, but recently realized that it won't work with the Stein harness. I would need to add more wiring and change a RS232 style plug. Not worth it. Simplest solution is to add a position sensor and keep the flap motor, which works fine.
Anybody want a complete RV-10 flap retrofit kit? Probably too late to return it to Van's.