And if it has a resistor, it doesn't mean that it is the correct value resistance.....those things have been sold with a wide range of values from ~ 0.3 to 5.0 ohms, which as you can see is a ratio of 17:1
What resistor you need depends on your coil & battery voltage.
Bottom line is that you want about 4 amps flowing through an ammeter (wired in series with the coil) when the ign sw is on, points closed, engine stalled. Choose a resistor to yield the 4 amps.
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