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On 10 Dec 98, at 19:38, BUFFBAUD@aol.com wrote: > 1. What's the procedure to zero out a speedometer? Do you mean how to calibrate the zero (or low end) reading? > 2. How do you calibrate a speedo to accommodate non stock size tires? This is done by a speedometer shop. It requires a special test bench which can drive the speedo as well as a pulsed electromagnet which is used to strengthen or weaken the spinning magnet inside the speedometer. They do not disassemble the speedos to do this. Don't bother to try this yourself. Check your yellow pages or Hemming's Motor News and call around until you find someone who can do VDO speedos. If you are starting with a working speedometer that you just want tweaked a bit, this will not be expensive once you find the right people to help you. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison,qT#&