I did a garmin reactor 40 AP on my boat a couple of years ago. I got mine from West marine and with the GHC50 it was right around $2800.00 (a couple years ago). I had an older non efi merc pro kicker and they didn't have that specific kicker listed for the throttle but a fabricated an OEM bracket and it works perfect. I did the install myself and it took a good 6-8 hours but it was well worth it. i have not had an issue since the install.