Dave, it seems there are too many ways to get to various points. I still couldn't find much on the Garmin site, but I did Google this up.
http://my.boatus.com/forum/forum_pos...TID=65159&PN=2
I have regular old fashioned analog gauges. The two things I'd love to have access too are the fuel economy readings, plus the engine RPM. The prices this guy states kind of threw me back.