Seems to me you need to get into it deeper.
what jumps into my mind is wondering about the tiny pins on each wheel that
catch the next pin or wheel after one turn....
that they are out of position somehow, or a shaft ''bearing hole' in the
body of the speedo is worn, something like that.

I bench test them by running them with a reversable drill......I get some
small screwdriver shaft or screw or whatever, grind it square so it can
drive......put in 'counterclickwise' direction.........it'll usually do
about 30 mph that way......
then you can watch what it does and try to catch it messing up.
I have parts speedo's if you need a tiny part or something.
scott
www.turbovans.com
----- Original Message -----
From: "Mike Miller" <mwmiller@CWNET.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, July 10, 2008 1:02 PM
Subject: Odometer problem

> My odometer quit a week or so ago. I pulled the speedo and looked it over.
> The gear was on and seemed to move OK.
>
> I put a small amount of light grease on it and put it back. Worked fine.
>
> Today quit again, again on X9.9 on the trip meter [first time 19.9 this
> time
> 59.9] and the total miles display kind of off kilter, no digit entirely
> square in the display, same as last week.
>
> Any body got any ideas other than spraying some cleaner in there, waiting
> for it to dry and spray some silicone?
>
> Mike