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What is the tach doing (or not doing)? Is it displaying an inaccurate RPM or just not working at all? Have you tried a different known good tach to make sure that you're receiving the proper signal from the HI-6? Are you using an HI-6 capacitive discharge ignition or the HI-6S inductive ignition? Which tach adapters have you tried and did they change the output at all?
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