I have a offshore catamaran and it is older it is all analog and I want to install a touch garmin with a nice large screen and have all my data shown on the garmin screen with many of the guages saved on the sides of the dashdoard area for backup.The problem is each guage needs to be put on a bus or channel so it can communicate with the nmea 2000 box, right?.Is this right how much work is it to do this just making connectors to connect each sensor to the bus or? any one want to share???

There is a company in Melbourne Fl that has modules to convert analog to NEMA. I forget the name now but it didn't look like to much of a issue.

If you're running a stock Mercruiser ECM, Fox Marine has a device for putting engine data on NMEA2k network.

http://fox-marine.com/index.php?route=product/category&path=81