speedometer fix posted by Tony90zx on April 19, 2016 at 05:03 PM
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Looks like you have a 1990 Z so yes, yours can be adjusted easily. What's not easy is taking out the gauge cluster. I can set the speedometer for any tire size but it may be easier for you to just do the math in your head for the different speeds or write them down for reference until you get used to them. There are on-line calculators that you can use to help figure things out.