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THERE IS NO ADJUSTMENT YOU CAN MAKE. IT IS AN INTERNAL FAILURE IN THE CLUSTER ITSELF. ME AND YOU DO NOT HAVE THE TOOLS TO FIX IT. THE CLUSTER NEEDS TO BE REMOVED SENT OUT AND REPAIRED.

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Q: How do you fix or adjust the tachometer on 1991 350 hp corvette idling around 2200 and topping tach at 6000 running 80 mph?
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