300ZX (Z32) Performance / Technical Discussions related to Turbo charging, Supercharging, Engine, ECU, exhaust, and etc. performance enhancements and Techical related.

Speedo jumps to 40 mph and stays

Old Jul 6, 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; Jul 6, 2017 at 03:41 PM.
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