Matlatcha: your still not understanding me. If you go the nmea 2000 route you wont need guages..
Thus saving space, and spending the $ on a better gps unit that can do both jobs and more.
The 740s is basically a sized down 5212.
Yes, you need to buy the bus that basically connects your engine readings (tach, fuel flow,temp, water pressure)from the computer of your etec to the garmin.
This route would still be cheaper than buying the i-comman guages and a 441s garmin for examle.
You would also have less clutter, and a much better unit.
Also ive heard some bad testimonials about the i-command guages.
Just do a search on thehulltruth.