When changing wheel sizes, final drive ratios or Speedo clusters it is essential to make sure the speedo cable worm and pinion drives are correct for the car. There are many combinations available, some work better than others, but one which is suitable for the application can usually be found. This is for a single 7 Tooth worm drive, DAM6028, compatible with the following pinions
To calculate the required drive please use my ratio calculator page http://www.guess-works.com/Tech/ratio.htm.
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