IIRC I used the Pertronix 1 unit with zero problems so far and I believe it has been three years. I installed it just like the instructions without any extra wires or hookups to a 12V source. The motor runs significantly better and the throttle response is crisp. I am going to take some black shrink tubing to mask the blue wire to make it appear OEM. Its the only extra wire in the unit and is hard to tell unless you're looking for it. I think I spent $80 on eBay.
