I had another Pertronix Ignitor II fail on me last week which was only 3 months old. Warranty says that they will replace it but no way will I ever use one again. Purchased a Summit mini HEI which uses an external coil but I'm having a problem figuring out the wiring. Directions supplied are a joke. I've been trying to get ahold of their tech dept but no luck and they havn't replied to my email yet. The distributor has a 3 prong plug hanging out of it along with a separate single wire which I think is for a tach. Has anyone else used one of these? Is this 3 prong plug suppose to plug into an ICM and what kind of coil can be used? Thanks Dave