The aux2 can only be used as a +- plug for transponders and such if you enabled the Aux2 in SSL in your tx. To use your gyro in aux2 you have to set aux2 in your tx as normal and adjust aux2 functions manually. I also have a type d with built in rx on my f1 and i already tried using a gyro without any problems, but didnt need the aux2 settings so it was easy for me.