Carenado PA-31 Integration?

[howfastisgodspeed]

Hey there, I am pretty new to modding X-Plane, just made one of my first liveries...anyhow, I am just trying to figure out how to integrate the RealityXP GTN750 into the Carenado PA-31 Chieftain in the place of its GNS530. I have set up the .ini file using the information from the .ini file on the JustFlight PA28R Arrow III. I am sure that the window size and position is incorrect, but the 750 doesn't even show up anywhere on the panel; instead, it just shows up as a windowed version of the GTN750. I know that the RealityXP GTN750 communicates with the G500 in the Chieftain, as I plugged in a >-D-> waypoint and the HSI on the G500 adjusted to this. Just wondering what I am missing as far as integration into the panel. I want to replace the GNS530 in the airplane with the GTN750 if possible. Any help is greatly appreciated! Thanks!