I fly the 707 in the VC entirely because I use a MATROX Triplehead2go system.  Everything seems to work well so far (I am still learning all of the systems) but while I can tune the VHF radios fine, the ADF radio seems to be useless.  I can tune the ADF both on screen as well as with my GoFlight radio modules, but the reaction of the radio needles in the RMI is totally off and indicates a completely false course.  Generally, if I click to get the ADF needle active in place of VHF 1 or 2 needle, the needle swings to the 90 degree position on the right.  It's always wrong.  Can anybody help me, please?  Thanks!  JS