Hi to all!!!
I just came upon this topic, so I have read most but not every word. So if I missed something forgive me.
My self, I have a Garmin 3006 about 5yrs old and would like to upgrade to Garmins 740. The 740 is a "whole" 1/2 bigger screen, a 7" display, NMEA 2000 (for me is great, easy hook up), faster cpu, smaller foot print and lighter.
This spring I am installing Lowrace's fuel monitoring system (you should check it out at
http://www.lowrance.com/Products/Marine/Digital-Gauges/ ). I had the Navman type, & yes it is a poor unit. The Lowrance system is NMEA 2000 too!!! There displays are NOT as nice as Garmins but are a LOT cheaper!!! There gauges come in 2 standard sizes that WILL fit into your dash board/panel. It will tell you, Capable of displaying the following NMEA 2000 data: GPS speed, tachometer, battery voltage, engine temperature, water pressure, engine oil pressure, fuel pressure, boost pressure, transmission oil pressure, atmospheric pressure, temperature, depth, engine loads, engine hours, fuel flow, fuel economy, fuel remaining, fuel used, fuel range, trip fuel used, seasonal fuel used, engine synchronizer, fluid level, GPS position, trim tab position, engine trim position, and engine alarms and warnings
If you have 2 engines, you just need 2 flow sensors and 1 display. The bigger display 3 3/16" LMF 400 can display 1, 2 or 4 things at one time.
Paul