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how to tell if i have a tach underdash wiring?

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i am curious what the difference is in the tach/non tach underdash wiring is. i have a couple large connectors on a 69 underdash wiring i purchased. one has around 8 female connectors and the other is round shape and also has many connectors. any descriptions would be nice.
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a couple of things you should know,
the alt wiring harness is diffrent for a tach car,the tach conector is a 2 pin hook up[1 female,1 male]
should be a red connector with a pink wire coverd in cloth wraping going to the ing switch
roughly around the tach aera,just above the steel dash part
if you dont have one you should get a wiring diag for your car so you dont fry anything

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