I got the prodigy p3 for my ridgeline at amazon, with the wire harness for ridgelne/pilot.
Locating the plug in my ridgeline took some time, it was way up inside by the steering wheel! PIA to get to! The rest was easy!
FYI - manual says to make sure 7pin connector is not plugged into truck when testing breakaway switch as it may damage brake controller.
"Not all those who wander are lost.." JRR Tolkien