I am having this same issue with my z28 right now..I used my programmer to try and fix the speedo and still I am on the highway cruising past cars and look down and see 60ish. Around town I am keeping up with traffic and look at it and it says like 35..40..let me know how you find out and that would help me out, I prefer the easiest method rather than taking the cover off.
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Formerly known as njbadaSS
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