Don,

You may get lucky and find a defunct '84 Wolfsburg Westfalia which came with
a tach from the factory:

http://i16.photobucket.com/albums/b7/misterpolak/Hershey/03.jpg

That should make the process easier.  I personally prefer the lack of "green
zone".

2009/10/10 Don Hanson <dhanson928@gmail.com>

> I am about to (tomorrow) attempt to swap instrument clusters in my 84 van,
> mainly to replace my oft-unsuccessfully fixed speedo/odo.  I also have a
> third partial cluster with a tach in it, so I am going to attempt to swap
> out my useless (still works on warm days, but ticks and keeps me awake when
> camping) analog clock and put that tach in.
> http://www.oldvolkshome.com/late_van_cluster_install.pdf
>
>  Don Hanson
>

--
Chris S.
Disclaimer: "Death and serious injury may occur"