Dash cluster gauges have gone crazy!

[rb68rr]

My fuel gauge reads all over the place and now my speedometer has quit working. When I bump the dash the volt light will flicker on and off. What's the problem and how do I fix it? Thanks, R.B.

 

[rb68rr]

Well, I popped off the plastic cover and just wiggled it around a little then put it back on and my speedometer started working again. Gas gauge is still not right. It will go from full to about 7/8's while accelerating and then back to full.