I'm thinking about putting electronic ignition on my Cub 184. What a pain it is to do anything with the points on that tractor. Not much room to to the oil filter, mower makes it difficult so I started taking off the distributor to put in points.Back side clamp bolt is hard to restart. I'm thinking electronic ignition would eliminate the problem for a long time. I have a 12 volt system with a 6 volt coil and a resistor. Do I still use the resistor and 6 volt coil or would I need a 12 volt coil and no resistor. I've never made one of these changes or know anyone that has. How does such a unit know when to fire?