Did you put oil in it (Just kidding) Like 4onThe Floor said could be the speedo cable. disconnect it and see if the noise goes away. If it does, pull the cable out of the housing and give it a light oil treatment.
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us. - - Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
(Just kidding)