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9tCarefully disconnect the speedo cable under the dash where it come thru the firewall and see if the end that is connected to the back of the speedo is abnormally loose. Mine was and caused a similar problem, I tightened it and problem went away for almost a year but it came loose again so I just replaced the speedo. Just as a side note, if you had any tranny work it could be an incorrect speedometer gear in the transmission if you replaced the trans that is.

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Q: What would cause a Datsun 280zx speedometer to read out a speed that was 5 to 10 miles per hour too high?
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