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Becuase you're revving the engine. Becuase you're revving the engine.

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Q: Why would a 1986 Toyota corolla 4ac engine tacho bounc up and down?
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Related questions

How do you install a Tacho in a 1985 Toyota Corolla Manual?

Does the vehicle already have a tach?no


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a speedo works off speed of vehicle and comes from transmission. a tacho measures engine revs and reads from engine or computer. neither have anything to do with other unless both are built into same electronic dashboard


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