Worked with Avidyne Field Rep who was really helpful shortly after posting this. On the ARINC page: Input 1. High speed, EFIS/Airdata
Input 2: off. Output 1: High speed, Gama 429, Graphics.
On the VOR/LOC/GS ARINC 429 Config page: RX off, TX High Speed and Format: VHF 429. SDI...