I have a 3500 "S" processor and have installed the Ray Allen POS-12 flap position sensor. It works fine and the EFIS displays the relative position of the flaps on the display. It seems to me that for those of us that have installed the sensor, if we were able to provide the EFIS with the total degree of flap travel that it would be very easy to display the angle of flap deployment near the indicator. Dynon units have this and it makes it much easier to extend the flaps with precision. Thanks.