Sticking Rev Counter Needle

[mpgscott]

Hi,

What would cause my rev counter needle to be sticking.  Sometimes it will not move as you rev the car and then all of a sudden it jumps to the correct revs.

Is this the instrument cluster or is it the feed to the cluster?

Thanks
Mark

[monzablue16v]

loose connection at the coil as a check before you take the clocks out