Anthony:
Overall they're a pretty simple install. In the stern, right after the Racor or Yamaha fuel/water separator, you install the fuel transducer into the fuel line. A wire runs from it all the way up to the dash.
You drill the dash for a 2-1/8" gauge (typically) and install it, wiring it to be ON whenever the ignition is ON. Then the fuel transducer wire you ran up from the stern plugs into the back.
Then you calibrate it by filling the tank, taking it for a run, and then topping off. Say you burned 12 gallon, but the tank only takes 11 ... the system has you input 'what it took' to refill, so as to calibrate itself.
Check out the or Northstar fuel flow meter series, as they're ~$120,
see here. Megabyte installed the Navman 2100 series and Northstar bought out Navman, so this is likely the same unit.
FWIW, I run Navman (now Northstar) color GPS units and what I LOVE about them (and their fishfinders) is that the 'computer' capability to add a fuel flow meter is installed. So if you need either a GPS or new fishfinder, also check them out. Their GPS units are bulletproof, simple and intuitive to use, and re-draw 3-5X faster than any Garmin unit I've ever used.
Also see:
http://www.classicparker.com/phpBB2/viewtopic.php?t=678
http://www.classicparker.com/phpBB2/vie ... php?t=1175