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Does anyone know how to measure tachometer accuracy?

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    #31
    Originally posted by nando View Post
    you know you could fix this whole issue with the right coding plug, right? E28 M5 AFAIK.

    a regular 6 cylinder coding plug doesn't work because the scale of the tach face is different on the M3.
    Ok, I purchased a E28 M5 coding plug and the RPM stil shows about 500 rev higher. :(
    But at least we know now that it doesn't work! :)

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      #32
      has to be a euro E28 m5?
      Build thread

      Bimmerlabs

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        #33
        Really? What is the difference?

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          #34
          Dead or near dead Si board batteries WILL affect tachometer accuracy so be sure those batteries in your SI board are fresh before attempting any troubleshooting. GL
          Owner - Bavarian Restoration
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            #35
            I agree but I think I have changed the so board couple of years ago. Also, the tachometer does not act erratic. It is acting normally as it is suppose to.

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              #36
              Originally posted by nando View Post
              has to be a euro E28 m5?
              What is the difference between the Euro and US E28 M5 tachometer?

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