fuel flow sensor options for raymarine MFD input

[snakedriver]

Looking for tried and true fuel flow sensor options. This is for older boats, usually sterndrive and inboard, that are carbureted and is obviously not networked. Had multiple customers ask me for this option. Trying to find best option and most economical means. Considering the Garmin GFS 10 fuel sensor. I like the fact that it hooks to analog gauge to read fuel level along with NMEA 2000 output for fuel flow. Should be able to use adapter cable A06045 devicenet female to plug into open slot in 5 way STng connector. Will have to extend nmea 2000 cable first, as it only comes with a 5 foot nmea cable. Any input would be appreciated.