Ok.. the pot the other day about speedometer operation has intrigued me.
Rotating a magnet in front of a jeweled pivot Aluminum disk...
Well, I have no idea of the electro-magnetic effects on Aluminum, so I will
buy that one. BUT... That tells me the odometer can be right on yet the
Speedo off. Correct?
Why I think of these things is in my daily 51 mile commute each way to work
in the Bay area, the odometer readings for both my famed reliable Toyota PU
and the Vanagon are dead on for  the entire length of the trip. In other
words, it's 51 miles whichever vehicle I take to work. I have also used the
milage markers to confirm that yes the vanagon is reasonably accurate in the
odometer readings. But the difference in driving conditions is remarkable.
With the Toyota, 75 to 80 mph (indicated) keeps me in the fast lane, top 5%
of traffic. 75 to 80 mph (indicated) in the Vanagon keeps me in pace with
the second to third lane traffic being passed by lots of vehicles. Does this
make sense?
So without a stopwatch, how would you confirm the speedo accuracy? I suspect
there isn't a way but just asking. And how would you calibrate the speedo on
the van?

tim o'brien
84 WasserBoxer
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