It's just a mileage counter.  There's a black box with a button in-line with
the odo cable that runs from the left front wheel to the odometer.  Push the
button to reset.  See:

http://www.vanagon.com/problems/oxs-light.html

If you haven't replaced it in a while, I'd pick up a spare OXS and toss it in
the glove box.  Get the generic cheap one and be ready to splice it in.

-Karl

> So, I was driving home last night and my Oxygen Sensor light came on.
> What exactly does that indicator light mean?  Did my sensor fail?  Does
> that mean it needs to be replaced?  The manuals don't seem to explain the
> indicator light just how to check, remove and install the sensor.  Thanks
> for your help. David Cooper 82 Westy
>

Karl and Kristina Bloss, Trexlertown, PA
'87 Westfalia Weekender  "Beverley" - 195K miles
http://www.enter.net/~bloss/vw/
PA/NJ Vanagon owner's mailing list: http://www.enter.net/~bloss/vw/pavanagon/