An updated LVAR bridge setup with Prepar3d v5 support is available at https://www.spadnext.com/download/SPAD. ... .Setup.zip
In this video I show using a 3D Print File to make a 737 Gear Handle...Then using Arduino Pro Micro build a 56 Button "Joystick" that will show up in SPAD.NEXT
Has links to the code and the place where I got the 737 File. Great for building your own switches and buttons.