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Interesting... but wouldnt the magnet lose strength with age and cause the needle to not raise far enough giving too low a reading?? I dont expect it to be perfect but wouldnt my raising the spring pressure bring it back closer? my error isnt linear... its about 5 or 6MPH at 55.. the gets to near 10 by 80. I also notice that this speedo suddeny jumps off the pin as the car gets over 10MPH or so.... Crappy Speedo! Keith > Speedos are calibrated by altering the strength of the spinning magnet inside > them. Amazingly enough, this is done by magnetically pulsing them while > they are still in their housings. It's an iterative kind of thing and I've watched it > being done: Pulse, check..., Pulse, check..., Pulse, check.... It's quite an > art. > > To get yours fixed, you have to find a speedometer shop that is used to > dealing with VDO speedometers. Our local place won't touch them because > they don't understand the european calibration scheme. American cars all > use a system of, IIRC, 100 turns per mile. So those little calibration numbers > on the back of our speedos just confuse them. > > - > Jim Adney > jadney@vwtype3.org > Madison, WI 53711-3054 > USA > > ------------------------------------------------ > To unsubscribe, E-mail to: <type3-off@vwtype3.org> > For more help, see http://vwtype3.org/list/ > ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/