First, it turned out that RMI pointer function for ADF doesn't work because of small "typo" bug.
It is corrected now, but will be available in next plugin update.
So, you just need to wait a few days.
For your BD5 central heading instrument (that I suppose has one needle used as ADF or VOR pointer) it is simple as I described before:
1) For the heading card you can assign either oof these two parameters (depending on what your plane model is used):
If you use the stepper motor for the heading, make sure it is connected so that the card rotates in right direction.
2) for the needle - use the RMI_Pointer_1 (will work correctly after update)
3) for the switch - "RMI_L_Switch"