Speedo barley working on 320, how to solve?

On my 5.0 MPI with Bravo III' s it comes off the STBD drive. You will see a tube that comes up to a sensor (Black box) on top of the engine. Remove the tube and blow compressed air into it. Hopefully it will blow the obstruction out.
 
blow compressed air into it

...and 3 weeks later it'll get clogged again.
Use your C80 for speed. More accurate.
 
Here he is...
unacceptable.jpg
 
It doesn't take too long for the tube to be clogged, but as Ron said, use SOG off your GPS for C80. This gives you most accurate reading anyway.
 
My speedo does not operate either. I want it to work so I can get fuel range readings.
 

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