You may have a bad ground, loose connection or a lead broken inside of the insulation. I would start by switching the tini tach pic up leads across engines to see if the condition follows the tach or engine. I experienced this when an ignition lead had broken inside insulation causing spurious signals that the tach interpreted as more sparks. It is normal for the C2 model of tach to stop reading at 10,000 rpm as this is the top of its range. Knowing if the problem is with the tach or engine will at least give a starting point for finding the problem.
GlenStatistics: Posted by gdewsbury — Sun Sep 12, 2010 8:03 am
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