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ignitor
Try this for an explanation that may make more sense to you. I have a 76 911s (2.7L) with Bosch distributor and I think your configuration should be similar.
1. The red wire goes to a positive source. There is a fused outlet on the electical panel on the back of the driver side rear fender. You want the side after the fuse. On my car I used the innermost fuse at the front end of the fuse block.
2. Before changing out the point system, the points have a insulation block that hangs out the front lip of the distributor beneath the cap. On the exterior surface of the block is a male spade connection. A black wire with female connector from the harness used to connect to the spade and so the points, and then to ground via the closed points. Connect a male spade to the black wire from the pertronics module.
3. Of course, both the red and black wire should be threaded through the rubber plug that hangs out of the notch in the front lip of the distributor. Install the pertronics module, set the gap. then set the block in the distributor notch so is set in flush with the distributor lip and the cap can be closed down. Attache the spade to the black wire and plug into the black wire that used to go to the points. Tape to insulate. Run the red wire along the harness to the fuse block and connect it to switch power (on with ignition key on, off with ignition key off). Back out the screw holding other wires onto this fuse connection block and insert your red wire and tighten. ( I used a thin crimp-on connector to be neat, but the wired twisted tightly should do.)
I'm just another driver who was frustrated with points, but I have what I think is the same set up. Hope this make sense. Going out to check my car to see if I've got this wrong and will re-post you within an hour if my car doesn't look as I've described above. This is fairly simple and you should have a schematic drawing with the pertronics unit.
Good luck.
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