Even if you go with the Pertronix conversion, you still need to get the coil/resistor situation sorted out. Get it wrong and it will over load the electronics and burn it out.
The goal is to have either a true 12v coil and no resistor (which someone may have already done), or have a 6v coil and a 1.5 ohm resistor. The end result is about 3 ohms resistance across the coil primary including the resistor in series (if needed).
Be sure to go by what is printed on the coil, not what the counter man sells you, (they are often misboxed) or check the ohms before you buy it. The NAPA IC14SB is a true 12v coil if you need one.
Pertrinix may try to sell you an expensive high performance coil, it is not necessary and of no benefit on a tractor engine.
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