2003 yamaha fuel,speed,tach managment gauges

[pathfinder101]

Hi All,

I've just purchased a Garmin 740S and I need help with connecting the fuel indicator/flow features in this unit to my Yamaha digital fuel/speed fuel guage... I've attached the diagram of how I want to install it however, my main question is that there are no loose wires to connect on back of the yamaha gauges...It seems that all wires are already attached to some other wires.... Any help would be well appreciated...

Thanks,
Jeff

[boats.net]

The garmin would have to be connected to a NMEA 2000 network to read that data and a 2003 engine is not NMEA 2000 compatable, the only connection you would be able make is for the fuel management gauge to use GPS speed for calculations through the GPS NMEA 0183 output lead connected to white wire on FMM.