These guys will do the repair:

http://www.van-cafe.com/vanagon_parts.jsp?pa=p&p=1974669302&pct=1546105405&ct=1885067091

Kim Brennan wrote:
> Okay, I've got two odometers in need of repairs. I've tried a few
> searches in the archives but can't find the info on 1) how to do it
> yourself, or 2) where to send it out for repairs.