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Evil Genius
Join Date: May 2006
Location: On top of my BBQ
Posts: 5,649
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bad ground (brown wire) going to those gauge, or a very low battery voltage. Sounds like they are loosing reference voltage.
When running, what is the voltage at the battery? When my alternator was going out, and the battery would drop to 10-11 volts, the tach would start acting haywire.
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