[jor]

Lakes in Wyboston usually have a few lying around, you might try Barry or bernard on 07958 750406 / 07957881496.
Although there is a website you might be waiting awhile for an email reply.
I can't recall seeing posts about the odometer itself, although if you use 'search' using 'yazaki' there will be a lot of posts, most are to do with the temp guage.
Here's a link to someone who has reassembled an odometer
thosbryant.wordpress.com/2019/03/27/odometer-repair-1994-volvo-940/

jor