Speedo problems

[ellis4pa]

Hey guys, back with more questions. I'm having speedometer problems still. I have replaced the the puck at the wheel, and the cable but still it wont read steady.
After i get to 50 and above the needle will jump all over the place, sometimes as high as 100. There is no way I'm going that fast, but as you can imagine having an accurate speedometer is important. Does anybody have any ideas? Is there something that could be loose and need tightening on the gauge cluster? I probably need a new cluster don't I?

Thanks guys