Ran the power and ground wires from the echoUAT box, to the panel and the ground block. Made the crimp connection at the "ADSB" switch on the panel. Added a Click-Bond so I would secure the wires and antenna with a zip tie near the echoUAT.
2 hours of work.
On 11/24 I configured everything with a mobile phone app, then went flying. I saw traffic, and when I got home I got a report from the FAA that the system worked fine. So now I meet the 2020 ADSB mandate :-)