To answer that question CORRECTLY without guessing or making possible faulty assumptions based on your limited info YOU HAVE TO CHECK WITH THE VENDOR such as Pertronix or whoever (as they know the switches current rating).
Whether or not you need a voltage dropping current limiting ballast resistor depends on:
1) The current rating of the elec switch.
2) The LV Primary winding resistance of the coil
Theres a chance you may still need some ballast even if not the typical 1 to 2 ohms as it depends on the switches current rating and the coils resistance. With a certain rated elec switch and a certain perhaps after market HV High Energy Coil (NOT the old stock coil) some ballast may be required BUT ONLY THE VENDOR CAN TELL YOU THAT although Billy Bob and Bubba might make a good guess maybe correct??? I believe some high energy after market coils that may still require some ballast depending on the switches current rating and the coil BUT YOU HAVE TO CHECK WITH THE SWITCH AND COIL VENDOR NOT ME OR BILLY BOB.
ALL THAT BEING SAID the typical off the cuff short answer would be:
If you had a ballast before its still used if you still use the old stock coil. If you had one before and its a 12 volt tractor, it must be a 6 volt coil, in which case IT DONT MATTER IF THE SWITCH IS A SET OF POINTS OR A TRANSISTOR you still need to only apply 6 volts to a 6 volt coil or else it will overheat unless the ballast is used. In addition, a 6 volt coil unballasted (on a 12 volt tractor) may cause the switches current rating to be exceeded.
Sooooooooo if youre only changing the switch from mechanical points to an elec switch and are using the old coil and its a 12 volt tractor and had a ballast resistor in place (i.e. prob a 6 volt coil) THEN YOU STILL NEED THE BALLAST.
If youre changing the coil and use a stock type full true 12 volt coil (NOT High Energy high voltage etc ) you probably NO LONGER NEED THE BALLAST.
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