My Odomiter Quit Working

[NineK at aol.com]

Hi,
The odomiter quit working in my wife's '88 Audi 90.  I took it apart this 
weekend to see if I could fix it and I found that there is a tiny gear that 
has a tooth missing.  

I called a couple of the junk  yards in town and could not find an audi 90 to 
get this part from.  Is there a good sorce for this kind of part in the web? 
does anyone have a used dash cluster from this type of car that I could get 
the odomiter from?

thanks
Bob Berger
88 Audi 90