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Because like all the other guages, each work independently of one another, and show different happenings going on with the engine. The tach itself could be bad, or maybe disconnected from the ignition system. You will need to find someone to troubleshoot it, if you want it fixed. If not, don't worry about it.

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โˆ™ 2005-01-19 06:08:36
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Q: Why would the rpm gauge not work when all the other electrical gauges are fine?
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