Re: Can Dynon display information from a King KLN
There's data in our wiki here: http://wiki.dynonavionics.com/GPS_Serial_Compatibility_and_Configuration_Settings. But to answer your questions directly:
The KLN89B should work with ARINC, and we think it does via serial as well. There's some very old back and forth with one of our beta customers on the first generation products that ends with: ""The KLN89B worked fine with the EFIS now, full CDI all waypoint info came up on HSI screen as well as EMS fuel pages.". It looks like they were talking about serial, but I'm not 100% sure.
ARINC 429 is required for glideslope on the 430/530/480/GTN series, as that's the only way the data is outputted.
The Garmin X96 VNAV output is accepted via serial.