The 3 wire is cheap n easy to install n readily available, it doesnt require any high RPM to excite and doesnt draw any trickle discharge when setting. I dont use a diode anymore (although theres nothing wrong with its use) but instead a safety current limiting resistor of around 10 ohms to provide at least some degree of protection. It serves the diodes purpose of preventing back feeding the coil so the tractor stops running when you turn the ignition off plus can limit the current. It or the diode will work just fine, its your choice.
If at Neg ground the coils lil - is what wires to the distributor and if the ammeter was originally for Pos grnd its leads need swapped so it dont read backwards
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