See here for details:
http://www.avsim.com/topic/498512-flyin ... try3525493
I also changed some entries in the .ini file to make the 750 act as NAV1/comm1...
[GTN_750_1]
MasterDevice = true
RadiosPair = 1
LinkVor = true
Works pretty good (I'm still having issues with GTN750 guiding NAV1 instrument, but you can view the CDI on the GTN750 for navigation)... perfect for the children of the magenta like me!

