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Hi, I just bought a 2000 Toyota Celica ZR, and noticed that it has a bouncy tacho, the previous owner installed a shift light which may have something to do with it, I have taken out the shift light but the problem is still there. What else can cause a bouncy tacho and what can I do to fix it. Thanks.

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Does it run well otherwise, or does it run like rubbish?

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I'd be double checking all wiring.

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