If you have Garmin GPSxxxx mfd it has a J1939 port for Yamaha engine data. Looks like an N2K port but it can "understand" more engine data (error codes) the N2k will not.
If you don't have Garmin, N2k will display rpm, fuel burn, fuel tank level, temp, possibly F/N/R?
I don't have Yamaha so I...