69 Charger electrical question - The Supercar Registry

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69 Charger electrical question

I have a 69 Charger RT 440 auto with air PS and rear defroster. I restored the car and upon completion I have an electrical gremlin. When I turn my fan on for the AC/heat and at idle my tach will move up to around 2000 rpm’s. When I accelerate the tach will settle to the correct reading. The tach works otherwise when the fan is not on or while driving. Seems at a low voltage situation the tach acts up. Any ideas?

Thanks

Lawrence

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