Once you added a computer and the conditioned 5V power source going a different route was easier. The cars where not built to be performance racers, heck the first version still used points, but with a CD ignition system and the points only fired a simple transistor at low current. Then it was crank triggers.
You are right as I remember looking at how some of the point operated electronic and CD ign was wired. I believe Mopar , Ford and GM all had point triggered electronic CD ign in the later 60's. And you are also right about the basic ECU not having the 5 volt system that once they went to a Fuel injected PCM they had to have a 5 volt circuit. Ron
