I have used just that thing in my 2.1 in the past.  Works well.  wiring is
pretty obvious for the tach.  +, ground, and *I think* the one that goes to
the coil is labeled "1" since that is terminal 1 on the coil.  Mine didn't
have the bulbs or bulb holders for the indicator lights.
Edward

At 06:09 PM 8/1/2006, you wrote:
>I'm toying around with an improved dash cluster design, mostly
>bringing everything forward, as I'm tall and the top of the steering
>wheel is in the way. Well I have a nice VDO electronic speedometer
>lying around to use (it goes up to 160MPH; how optimistic!), but I'm
>hesitant to drop a big wad of cash on a new VDO tach for what will
>probably end up being Yet Another Abandoned Idea. I do, however, have
>a line on an old Porsche 914 tach for really cheap-- plus I like that
>it has turn signal and high-beam indicators in it. It worked with a
>2.0 Type IV in a 914, so it oughtta work with a 2.1 wbx, right? Does
>anyone have the wireup handy?
>
>--
>John Bange
>'90 Vanagon - "Geldsauger"