Based on the Pro Line 21 autopilot, we've recently added the PL21 Autopilot Unit to our list of products. This unit is supplied complete with a controller board for communicating via USB to a simulator.
The unit is fully backlit, as shown in the above photograph.
A small software program is included, which can be used to send commands from the panel to a compatible simulator that has a registered version of FSUIPC, but there is also the ability to communicate directly with the Arduino controller. This allows you the option of writing your own software. Full communication details will of course be provided.