I would still suggest checking to see if it'* seated properly. With expansion and contraction from temperature a misaligned or improperly seated connector may be causing you a problem.
If this is fine, my other thought is a known problem with the stepper motors in the cluster. There was a technical service bulletin issued for SOME Bonneville clusters because the stepper motors that move the needles would chatter and stick. There'* just other things happening here that didn't make this my first thought.