Recently my speedo has not been working right in my 91 rs. I think it may have something to do with the stereo because it started shortly after getting a new stereo installed. When i take off a lot of times it doesnt move untill i get to about 35. Then when going anywhere from 25-55 it will bounce around...like from 50-60 and back again. When i get going to higher speeds it usually wont do it...like when im going 75 or more its pretty much still. Any ideas what this might be or how to fix it???

 

TTT