Allan, No, you could get by with an existing stock coil (if voltages and any ballast etc is correct) and gain at least some spark gap energy (faster more positive switching) using an electronic switch versus the old mechanical points, but to get the most bang for the buck that elec switch has to offer and realize more spark gap energy for better ignition, I HIGHLY RECOMMEND you couple the new elec switch with a high energy high voltage coil the vendor offers to match the new switch. Using a high energy high voltage coil and an electronic switch, one often runs a tad wider spark plug gap also. Next, be sure to match the new coil with the switches current capacity as I believe some switch vendors offer different switch ratings dependant upon what coil is used. As far as wiring, all thats usually involved is two wires out of the unit mounted in the distributor base to replace the points that run one to each side of the coil, piece of cake to wire. A magnet fits down over the distributors cam shaft lobes which triggers the switch. The existing switch and wiring to the coils input (regardless if new or old coil) ought to suffice provided its all in good condition. NOTE If a high voltage coil is used and youre running a wider plug gap, good plug wires and a good distributor cap etc must be used..... .... Check with the vendor as far as plug wire recommendations cuz some of those high performance systems actually use carbon core plug wires which I would not use otherwise. NOTE is this 12 volt system????? If so although its still possible to use a 6 volt coil and an external ballast resistor, I highly recommend use of a 12 volt coil and do away with the ballast. CAUTION these units are polarity and voltage sensitive, BE SURE and buy a unit to match your ground,,,,, your voltage,,,,, ,,and a coil suitable for the switches current rating. Hope this helps, let us know John T
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