Even though this has probably been mentioned before or the devs are already aware of it, I just want to mention that the heading indication on the directional gyro / heading indicator on most US helicopters has an incorrect behavior. The currently flown heading is shown by the rotating needle on the instrument. This is incorrect, as the needles (it is actually tow needles that are directly over each other) don't show the flown heading, but show the (magnetic) bearing (QDM) to the tuned radio navigation beacon (NDB/VOR).
As far as I know ARMA does not support navigation to fixes (radio beacons), the needles should simply always stay in the 12 o'clock position.
The flown heading should be sown by the compass card itself rotation so that the currently flown heading is always on the top (12 o'clock) position of the instrument:
In the F-4 Phantom for example this is correctly implemented.
All in all just a minor detail and I would really like to say that the devs have done an outstanding job with this community DLC and the attention to detail across the board is simply amazing. Keep up the good work!