Dear Dave,

At 07:05 PM 12/3/2009, Dave Yates wrote:

>http://www.twistedlimbpaper.com/brian/vanagon/Odometer.htm  (words
>here, but image isn;t really convincing)

I think this (from the above link) is pretty clear if a bit convoluted:
>   Make sure it goes on the correct way.  The little teeth on it
> have the same configuration as those on the Number Gears. If you
> look at the picture above, the gears all have teeth all the way
> around on the left side, but only two teeth on the right side (when
> looking at them upside down, as in the picture). You'll have to tap
> the shaft into the Metal Gear and the rest of the way into the housing.

In other words the continuous teeth face the outside of the
mechanism.  This is necessary so that once every full revolution of
the gear, the two inner-facing teeth will advance the tiny outer gear
so the associated number wheel rotates one number.

>http://www.drivewerks.com/tech/mult_gauge_repair.htm

This image shown from the front of the mechanism agrees -- the
continuous teeth face out:

Yours,
David