info?
I'd need the instructions for that particular coil to be sure, but in general:
The wire from the (-) side of the old coil to the distributer needs to be removed and discarded, along with the condenser as per the pertronics instructions.
If your coil needs a resistor to work properly, simply connect the origional wire from the old coil to its (+) terminal and it'll be fine. A new wire will need to be run from one of the first 3 fuses to the red wire of the Pertronics, and the black wire from the Pertronics will need to be wired to the (-) side of the coil. All done, fire it up and go for a ride.
If your coil doesn't need a resister to work, then you'll need to run that new wire to the (+) side of the coil as well as the red wire of the Pertronics. The old coil wire will not be used, and can be taped off or removed.