Re: What to buy???
If any of the head units are Nmea2000 compatible, you will have to buy the flow sensors and install in the fuel lines. It's a plug and play
These head units aren't cheap. Lowrance and Garmin are a couple that come to mind. I have the Lowrance head unit. You can also buy a gauge that you install in the dash that does the same thing. ( Fuel Flow and usage only )Lowrance LMF-200 Multi Function Display No Sensors.Or the LMF-400