This is extremely helpful. I am ingoing to let my lift down so I can check the chassis number. I will also check if there is any reference to RVI or RVC on the face of the tach.
The wiring diagram you attached matches the one in my workshop manual, but the components have different numbers. My car was one of the first 3500S 's but it was built for sale in Germany. The shop t hat rebuilt my alternator noted that it was German specification. The BW35 trans was also European spec.
I am also going to call MSD Tech Support. Part of my concern is not to cause any harm to the 6AL MSD unit which connects to the coil directly with an orange wire to positive and a black wire to negative.
The newly rebuilt 3.9 engine will not be started until I find some answers to these issues. I promise to post how they are resolved,, along with a diagram of the wiring and some pictures. I will have fire extinguishers handy at first start.
Thank you very much. Keith Hennessee