Hi Jim,
Just install the unit as per the instructions. Then you can download a free uAvionics app for your phone or iPad. You connect via WiFi to the Echo and can then set-up and monitor the Echo. During the simple set-up process you choose between wiring direct to your transponder or using the “sniffer” function. I wired mine direct to my Garmin 327 transponder, but you have the option to do it either way. There is nothing special you have to do other than that.