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I have a SS dash in my chevelle but the tach is not hooked up. I was looking to hook it up and was told the wire goes to the negative of the coil. Is that correct. Also, There are two studes coming out of the back of the tach. Which one does the wire get hooked to? Any help is greatly appreciated.
 

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The tach wire should come out of the dash harness, pin 9 of the gauge cluster connector, a dark brown wire, single wire breaks out of the harness and goes through the firewall to the negative side of the coil.
 
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