A rough guide is better than no guide! So here's a walk through one of my setups. Leave comments if you have any questions. Maybe I'll make a more formal video after some feedback.
This wiki page covers what I'm demonstrating in this video, and includes supported receivers. Note that not all AS3X+ receivers support additional gyro systems, which are needed for thrust vectoring.
https://wiki.spektrumrc.com/spektrum/as3x-aux-output-setup-and-multi-gyro-system-guide