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Speedo jumps to 40 mph and stays

Old 07-06-2017, 02:23 PM
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Speedo jumps to 40 mph and stays

Everything reads fine at start-up but as soon as i start rolling my speedo jumps to 40 mph and stays there? What could be the cause? Odometer works fine..1990 nissan 300zx tt 5-speed. Thx

Last edited by statzera; 07-06-2017 at 03:41 PM.
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