Here is mine. Since my cockpit is already very crowded I opted for something very small. The OLED display is used to assign different functions for the segment display and the two rotary knobs. Hence I can use a lot of functions.
Currently I can control AP HDG, ALT, VS; BARO; COMs, NAVs, ADFs, XPNDRs and OBSs. I can also display current Altitude and Speed (great on takeoffs and landings).
As soon as the library gets its next update I want to include AP NAV & GPS.
