Yamaha Digital Tach Water in Fuel Alarm

[RockyProline]

I have a F225 2004 and have replaced the Multifunction Gauges and harness to the outboard.
The Tach is indicating the water in fuel alarm (flashing) but when the motor is trimmed up above level 5 on the tach, the water alarm stops. I have unplugged the trim sender, when the motor is trimmed down, and it stops the alarm also.
To my knowledge the motor hasn't got the water in fuel sender fitted, and the motor runs fine.
The wiring harness from the outboard has the pink wires common to the trim sender and to the alarm output plug, this is also indicated in the workshop wiring diagram. I have disconnected the red/white wire on the 4 pin plug which connects to the common pink wire to the trim sender. This has cleared the alarm for the time being.
Any information would be greatly appreciated.
Dave

[rodbolt17]

whats the part number of the replacement tach?

[RockyProline]

There was a Blue tag attached to the gauge with part number 6Y5-2818R-32 printed on it, no part numbers on the gauge.

[rodbolt17]

can you post a picture of the connectors on the rear of the tach?
certain tachs wont work correctly with 04 and older engines,some require an adapter.

[RockyProline]

It has the 2 four pin plugs which plug into the loom to the motor and 5 other wires that go to the remote control / key start .
I can get a photo after work.

[RockyProline]

2 plugs and 4 wires total of 12 wires to the gauge.

[rodbolt17]

ill try to post the fix tonight

[RockyProline]

rodbolt17, did you find the fix?
I have disconnected the white and red wire - it has cleared the alarm.

[rodbolt17]

what was the white /red connected to?

[99yam40]

the red/white wire on the 4 pin plug which connects to the common pink wire to the trim sender.

Just thought this would help some