I think you'll find all of the details in the archives.
There was a post about three weeks ago with wiring diagrams and the whole
scenario.
I think you just need to run a tach wire from your coil and swap a few
wires around in the long white connector strip.
You will need the printed circuit for the tach on the back of your
instrument cluster.

Stan Wilder
83 Westfalia Air Cooled (livin' in the sixties I use a sun Tach 3.5"
Diameter mounted up on the dash, $69.95)

On Fri, 22 Jun 2001 07:50:23 EDT Chuck Mathis <CMathis227@AOL.COM>
writes:
> In a message dated 6/21/01 5:34:19 PM, ctb1@PEOPLEPC.COM writes:
>
> << Anyone know how difficult it is to put a tach from a later
> Vanagon into
>
> something like a 1984?  I'm assuming none of the wiring is there for
> this...
>
> Thanks.
>
>
> Chris >>
>
> I put a newer model tach in my '85.  Most of the wiring was there.
> Some had
> to be moved around on the big connector block.  I did have to run a
> wire from
> the coil forward though.  I've heard some vans even have this wire
> in place
> -- look for a green wire coming off the coil.  If you have that the
> swap is a
> piece of cake.  Without it it is a minor annoyance.
>
> Chuck
> '85 Wolfsburg Westy - 'Roland the Road Buffalo'

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