There's a good article on how to fix the older mechanical odometers here:
http://www.dieselgiant.com/repairyourodometer.htm

For the newer electric driven models you can get new gears here:
www.odometergears.com

Make sure you get both gears or you'll be doing the job twice.

Danny

__________________
1984 300SD Turbo Diesel 150,000 miles

OBK member #23

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination