Coil - resistor compatibility question.

^^But the coil/ ballast combo changes with every spark cycle. RPM and dwell time changes the relationship. I don't think you can make those assumptions as to current, but yet you actually (correctly) said that you need sophisticated equipment.

You are right, tho, it is a very loaded question.

It also seems to me, that just as I mentioned, modern ECUs are not what they used to be, at least in the aftermarket, and who knows if MP were in their later years, either?