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Old 06-23-2016, 12:30 PM   #2 (permalink)
JARblue
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Join Date: Mar 2011
Location: Austin, TX
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Like while you're driving? And the car sounds and drives ok? If so, there's most likely a bad connection somewhere with the dash harness. Most likely a damaged or loose connector or the tach lead could even have come loose from the harness. Could be the tach itself, but that appears to be far less likely.
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