I put an pertronics style hei distributor in with external coil. It is not the original as this is a late 68 tach. Can anyone show or tell how they hooked up the wire to a pertronics distributor? I have the ground wire to firewall and the gray wire to ignition spade on fuse box. Just need to know if pink and black wire can be hooked up to pertronics some how? Is there a 1968 firebird low style tach available to hook up with this set-up? Thanks Bmxer