YAMAHA MULTIFUNCTION GAUGE- Tach and Speedo/Fuel Gauge

Hey I''m desperately in need on a wiring diagram for my Yamaha Multifunction gauge for my Malibu Flightcraft with Pro-V200 on the back. The Tach works perfectly but the Speedo/fuel gauge does not work. Can anyone please please help me?
Many Thanks,
Andy McD

[boats.net]

The speedo has
Red 12 volts positive
Yellow 12 volts key on power
Black ground
Blue backlight in gauge
White fuel level sender lead