Ugh...that stinks. I learned my Airmar transducer was only compatible with my Garmin if I bought a $70.00 junction box to go from 7 pin to 8 pin- but it worked. I am not super handy when it comes to that stuff so I hired a local guy that does electronics installs. Fortunately I didn't need a new transducer, especially since boat goes in this afternoon. Very happy that my Raymarine Autopilot is fully functional with the Garmin system- lots of neat functions like trolling patterns loaded into it. I'll have to get you the mount info, I got it at West Marine. Expensive but works nice.