Electronic ignition
To make this "more murky"
YOU DO NOT NEED TO CHANGE the factory resistor wiring, IE to hook up/ replace the points with this:
Remove factory resistor, and plug the new one in its place
"Tap into" the blue switched ignition run wire (top of the resistor) and run the power wire to the ECU as shown
Remove old distributor, and hook black wire from ECU to coil neg, and tachometer at this point if used
Install new distributor and plug 2 wire connector from ECU to distributor
Make CERTAIN ECU is grounded
The point I'm attempting to make.........is that there are actually VERY FEW wiring changes made
IF THIS SYSTEM FAILS and you need to limp home
You can just unplug the ECU and drop in a points distributor and it will run, assuming coil/ resistor/ wiring is OK