Speedometer,Tach and fuel gauge problems

i have a 2006 xpress h51 with a 90 hp yamaha. the tach and speedometer and fuel gauge do not work. Tach and speedo will not move and the fuel gauge always says its full. Checked all fuses and looked for loose connections and found no problems. Cleaned the speedometer line also. Any help would greatly be appreciated.

[boats.net]

Check for 12 volts and ground going to gauges with ignition key on, you didn't mention if you have Yamaha guages or other brand. The speedo pickup on gearcase is probably plugged up, disconnect speedo hose and try blowing back to motor and check for air coming out pickup hole in gearcase.