The resistor to the coil should be around 0.55 ohms
The resistor to limit the current to the ECU should be 5 ohms
1972 Imperial & Chrysler Ignition System Service Book (Session 292)
When the engine is running, if current is flowing through the 5 ohm resistor, there will be a measurable drop in voltage. How much will depend on the current draw of the ECU.
Here's an example from a member whose truck had aftermarket resistors and ECU.
He measured the resistance (revealing it is an incorrect replacement) and then the voltage while the engine was running.
He posted the measurements on this photo
View attachment 1715757868
The voltage drop across the 1.3 ohm resistor is the result of resistance to the flow.
The lack of voltage drop indicates no flow to the ECU through the 5 phm resistor. Most likely because the replacement ECU isn't using the 5th pin.
View attachment 1715757869
