Strange speedometer behavior

Well i noticed that my speedo doesnt seem to work at times, and if I punch it real quick it will jump up dramatically to a speed i am not going but then drop down, and not read but if i do like 50- 55 it will work but if i do 65 for instance it will stay at 55 then if i speed up a little it will jump to my actuall speed and sometimes drop back down. I was thinking maybe the speedo gear? Any other suggestions?

Also I dont know if it has anything to do with it but my cruise control works fine, so i would think that means the speed sensor works fine?

No these are the factory gauges, and for those who are going to say that i should read up on it I have and what I find are people who are having a problem with a speedo thats inop. But mine works from time to time but will seem to get stuck and jumps to like 90 when at WOT in 1st and sometimes second.

Well I dont know if anyone cares, but I figured it out. The needle was stuck against the gauge cluster face. So I tapped it and it went to normal and well I am just going to pull the cluster and I guess put everything well in its place.