I need to replace the red ignition coil wire and I'm looking for an original plug in harness to take the red wire out and put it in my original...(PO cut the wire to install electronic ignition...I'm going back to original ignition system) I see the wire is thicker than the same coil wire on my '66...I'm wondering if there is a reason for that so I make sure I get the correct gauge wire to put in my harness.