Yamaha Fuel Management guage ?/wiring diagram

[teaklejr]

Hi. I am having a problem with my fmm unit. I have a 1997 Grady white with twin 2006 200 hpdis. Last week I noticed I was only reading the starboard motor fuel consumption. I guessed it was the fuel flow sensor but I was wrong. Now it will read the port motor but I know the reading is not right and the starboard motor is not reading. I noticed at the back of the gauge the is a green wire that is not connected also a ground wire not connected. not sure if that is right or wrong. How can I get a wiring diagram for this unit. Also any ideas on what the problem might be. The green wire might have a white tracer with it but can't be sure right now. Any help would be great.
Thanks

[boats.net]

The green/white wire connects to port tach(connect to green wire at tach) and black wire should connect black wire of same engine that the yellow wire is connected to.
Yamaha FM Gauge.doc