the spedo was act jerky for a whilke then worked fine for the past 2 days. now it desn't work nor my odometer, but the rpm gauge still works? any ideas on how to fix it. donn't wanna get pulled over and get the knwo how fats yuou were going talk lol. thanx again

Sounds like either you cable broke or you guage cluster is FUBAR'd where the speedo cable broke.  My '96's speedo did this when I got it in March.  Made noises too.  About a week after I got it the thing goes nuts on my morning drive to work and then the needle goes dead.  Turns out the cable was all corroded and dragging, making it vibrate and making the needle twitch like that, and that wore out the guts of the speedo.

New speedo cable later (local Chevy dealer, $47ish) and new cluster (TVT over on Zuwharrie.com - price varies), and it's all fixed.

The tach has nothing to do with the speedo and odo so it still working means nothing in this case.

so to get to the cable do i need to take t he woel dash off or just the cluster?

Neither, just reach under the dash and pull it out.

It's a bit more complicated than that...actually a lot.  Do a search here and on Zuwharrie.com, we've discussed this in depth several times.