You need a Universal Hub to connect your AuthentiKit flight controls to a PC. If your flight controls do not include one already (starter kits include them) then this is what you need. This is the standard style of hub without the premium cable clamps.
This is the software written by Leo Bodnar to allow you to set adjacent pins on your Authentikit/BU0836A board to behave like an encoder. This is commercial software. You are free to share it however it does not have the indicated GPL licence as shown.
This LUA script provides full Differential (Toe Brakes) to the MSFS Spitfires by Mixing the Single Brake Lever input with Rudder Input. Works in MSFS with any aircraft with a single brake analog control. Requires the FSUIPC7 (full) version to work.