If the Vanagon is 86 and newer the wiring for the cluster is the same
whether it came with a tach or a big clock.

You can switch 86+ clusters back and forth between tach and clock types
without adding or changing wires.

Mark

>
>
> most '85-'86 westy weekenders didn't have tachs.. usually the '87's  did.
>
> anyway, you may be lucky and find that your plug is already pre-wired for
> the tach cluster..
>
> if it isnt, then you will need to swap some pins around in the plug and run
>   a wire back to the coil.  it should be in the archives... ive done it
> before several times. did the same thing to my '85 doka which had no tach.
>