Just a quick update on something I've been working on in the last couple of months.
I've designed and 3d printed throttle quadrant inspired on the Boeing 737 to use in Prepar3D/FSX/MSFS. The potentiometers connect to an Arduino Pro Micro, which register itself as a USB HID gaming controller, making it pretty easy to use inside the simulator.
The STL files for the 3D printed parts can be downloaded for free here:
https://www.thingiverse.com/thing:4578576
You can check the throttle quadrant working inside P3D with the PMDG 737 in the video below: