I'm pretty sure that the Tach is driven by the ECU. If the ECU wasn't reading the engine speed correctly I doubt that the engine would be running correctly as the spark, and FI would be all screwed up????
My guess is a sticky needle or some other problem on the gauge cluster itself.
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Dave
- 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0
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