Interesting.  I could see a problem in the cluster causing current to
flow through the speedo cable, but how would a engine or transmission
ground cause that flow?  (since the speedo cable connects to the left
front wheel.)

I once did  a very accurate and cheap DIY trip computer on my
van.  You can go to www.snurl.com/vanagon  and it is listed in the
right column.  Actually if you like any of the stuff I have on there
you might want to save it because I'm not paying for that site
anymore and it will probably go away for a while at some point and
then turn up elsewhere in the interwebs.

Edward

At 08:20 PM 4/13/2010, David Beierl wrote:
>At 08:14 PM 4/13/2010, Joe T. wrote:
>>No way!  My cluster is out of an '84 Wolfsburg full Westy and the
>>speedometer has always been way, way off.  I just thought it was a
>>problem with that particular speedometer.  Learn something new every day.
>
>Also bear in mind that a poor engine/transmission ground can pass
>enough current through the speedo spring to ruin its temper,
>resulting in a gauge that reads high.  I forget the page in Bentley,
>somewhere in the (lousy) instrument section no doubt.
>
>Yours,
>David