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Hi Guys, Is my 30 year old tac ready for retirement? Original tac started to skip yesterday, it will go to correct rpms while driveing and then go down to 0 and back to correct rpm. Does this every minute or so, checked lead on coil, seems fine. No corrasion on wire or metal lead. Is the ground wire from the tac connected with dash grounding harness or is it seperate. My 1969 chevelle service manuel wireing diagram doesn`t show tac wires, all other gagues work fine.Any ideas, Thanks Guys

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BILL TIRELLI TEAM CHEVELLE MEMBER#280 1969 BLK CHEVELLE SS396 375HP 4SP 410 POSI
 

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I would send the tach to a guage resto shop, check out Hemmings motor news and you will find multiple places to choose from..

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70 chevelle ss396 conv
66 chevelle ss396 hdp/conv
 
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