Don't know how far you intend to disassemble yours or for what reason, but I only needed to get to the gears so that I could fix the odometer.� Once I removed the needle and face I unscrewed the four screws that hold the clear plastic gear holder to the black plastic base and could pull it out just far enough (outward travel stopped by the spiral spring on its shaft) to gain access to the gears by a little additional persuasion.� 
�
I never took apart the back part where the speedo cable enters the mechanism.
�
I had a link to some pix that I now can't find, but there are numerous helpful threads on Samba if you search "odometer."
�
Stephen

--- On Fri, 7/23/10, BenT Syncro <syncro@GMAIL.COM> wrote:

From: BenT Syncro <syncro@GMAIL.COM>
Subject: Need info on dismantling speedometer
To: vanagon@GERRY.VANAGON.COM
Date: Friday, July 23, 2010, 10:35 PM

Hi All,

I'm trying to take apart a Vanagon speedometer. Need some advice before my
experiment turns into an unmitigated disaster.The speedo is now out of the
cluster. The needle and faceplate is off. Four screws and seven years ago...
I mean, four screws taken out. Questions:

1) What is holding it together? There's a brass fitting of some sort holding
it on the pin for the needle. Looks scary to remove because getting the
right tension will be a challenge.

2) How is that white nylon tail piece attached? It's the part where the
cable goes in. It looks like it might spin off because there are three slots
for maybe a special tool? Or does it just pop off somehow.

That's it for now.

TIA,

BenT