Yamaha Fuel & Tachometer Sensor

[Tunes]

I have a SQUARE COMBINATION SPEEDOMETER AND FUEL MANAGEMENT GAUGE. I can't set the fuel tank level. It's always at 1/2. I've tried to set the fuel sensor but that doesn't help. I also have a SQUARE TACHOMETER for each engine and I can't set the trim angle? Any suggestions.

 

[Grog]

Both being bad sounds like it may be in the unit, check the wire connections at the unit.

If you disconnect one wire does the level change?

If the motor trims but the reading doesn't change, there is a small lever under the motor just above the trim unit. They are famous for getting stuck, if it is lube it up and gently rotate it until it frees up. If it's not frozen and you have access to a meter, check the resistance as you move the lever. If it doesn't change it's the sensor.