I guess by now you've figured taking the cluster apart is possible, so I cant add much here but to say that I had mine apart for the same reason and I had no trouble.

Just be careful not to use harsh detergents where the white lettering painted on the clear plastic for the idiot lights etc. Fantastic, or 409, will dissolve that lettering instantly!

I also took the liberty and repainted the instrument needles. I used TESTORS model paints, mixed yellow with orange to get the right color!

If your odometer is not working, here is an opportunity to glue the little gear that is said to be the cause......you'll have to look for that thread here at Mshop, but there is a method outlay for repair!

Good luck.............BB