Connected the Dynon D6 - this is the first avionic I can actually test for connectivity since it has an internal back up battery.
Used a small molex connector on the GPS 496 flying wire for Post #1 to connect to the Dynon D6 for GPS Speed. Connected the harness to the remote compass and Dynon. Powered up for first time.
Heading and attitude look reasonable (RV8, so naturally sitting at a climb angle).