I was driving and noticed the engine misfiring for a short period of time then smoke rolling out of the tachometer. The car ended up dying in the middle of the road. Found the ground cable from the battery came loose from where it was mounted to the frame which shorted out the tach and blew the MSD box.
I had to get a new tach and MSD fixed the box. It was obvious the cable came loose because the lug was broken so I replaced it.
All works like a Champ! I also updated my AAA card for better towing distance!