Tach Drive Adapter Tang to Square Drive MSD8491 Product:Default Title 90° Male AN Union With

90° Male AN Union With Port

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Tach Drive Adapter Tang to Square Drive MSD8491 Product:Default Title 90° Male AN Union WithTach Drive Adapter Tang to Square Drive MSD8491 D8491 The standard tach drive for MSD Tach Drive Distributors is a 3 16" tang drive cable. In most cases this type of drive will work, but for those who require the 0. 104" square drive (Corvette style), MSD offers a Tang to Square Drive Adapter to fit all MSD Tach Drive Distributor assemblies.