I have just fitted a lowrance LMF400 gauge to Pigs Ear, I then added the EP60R to give me fuel flow:
EP-60R Fuel Flow Sensor Electronic Probe
and the EP65R to convert the tank sender into NMEA2000
Accessories: LOWRANCE EP65R FUEL LEVEL EP SENSOR (120-41)
The gauge and senders came to about £360 all in however I can also use the gauge to display data from the GPS aerial such as speed. I also have a lowance head unit so can display fuel data on there.
My Honda is pre NMEA 2000 however any Hondas post 2005 should be able to display fuel flow data directly without the need for the sender.
Also worth bearing in mind, if you already have a GPS system that is NMEA compatible then you should not need to buy an expensive gauge, instead you may only need to link the engine and the GPS to a simple NMEA network to display fuel flow data.