Now days I'm trying to get opentrack in DCS. I finally have a good working copy although its a work in progress. Put the files to the respective folders in your pc and see a different approach in flying. In my case, DCS.ini file goes into the C:\Users\user name\Documents\opentrack-2.3 folder and TrackIr.diff.lua into the C:\Users\user name\Saved Games\DCS\Config\Input\P-51D\trackir. Hope this helps some people cause, I spent a lot of time trying to configure opentrack to work properly in DCS. Instead of configuring only the opentrack parameters in the program I also tweaked the parameters in DCS/OPTIONS/CONTROLS/P-51/AXIS COMMANDS/TRACKIR. I'm using a webcam and the neuralnet tracker.
TrackIR.diff.lua DCS.ini