Kent: Had I known I would have taken pictures while the cluster was out to make it simple enough for a Caveman to do it. It will destroy the tach if wired incorrectly. Yes, two well known to this forum told me exactly that. It's why I made sure it was wired correctly before the cluster was installed. I plugged the tach leads together so it would run until I had completed the interior.
The same person telling me I'm wrong told Randy Gillis the same thing. Most of you know Randy Gillis, he needs no introduction here nor his qualifications.
I know most of us try to hide modifications to our Shelbys. After looking at the abortion of a schematic offered by the empty heads at Pertronixs I found a simple way to wire them and hide the modification with the exception of the 14 gauge wire running from the tach lead under the dash to the red wire for the module in the distributor. I taped it to the lead running to the coil and it is in the clips on the valve covers which makes it hard to see. There's no real need for a schematic.
It's one wire. The balance is wire per instruction. The black lead from the Pertronix goes to the negative terminal of the coil. The Ford harness wire slips right on the terminal as it was.
I would recommend the II, as it no longer requires the dwell to be set. The rev-limiter is really the only advantage of the III unless you're using it as a trigger for an MSD box.
If pictures of the firewall forward and coil wiring pictures will help I'd be glad to provide them. I am not planning on removing my cluster for anything at the moment, so that would be more difficult to provide.
Being this has been such a confusing factor for many, I wish I would have done a step by step .