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What you will need to test the speed on the tri-ducer is a magnet. One one of the blades there is a magnet that is what breaks the signal and sends the speed data to the plotter.
If you do not see that one blade of the speed wheel is magnetic, then the magnet in it has fallen out and the tri-ducer will need to be repaired.
This tri-ducer does not give you the true wind. That is the aerometer that is on the boat.
I just sent it to you.
Here you can get a repair kit for the speed wheel.
On the plug end to the unit. Make sure that the connection os clean and tight to the unit. Also follow the wire lead as far as you can to make sure that it is not cut or chaffed anywhere.