speedometer water leak

[Bass Master 24]

I have a 50 hp Yamaha 4 stroke. When I go to full throttle it leaks water under my console. It has Yamaha gauges. I removed the plastic tube from behind the speedometer and it blows water. I plugged the tube to check for leaks no leaks. Any suggestions on what to do next???

[rodbolt17]

have someone watch it when its leaking to determine if its the tube connection or the gauge failed.