In a message dated 11/22/2004 12:36:36 PM Pacific Standard Time, hyarnell1@earthlink.net writes: The pertronics uses magnetic triggering; the Crane uses an LED. Technically, the Pertronics uses a Hall-effect sensor. I prefer that to the LED - I have seen errant voltage inside the distributor wipe-out an LED. It would be hard to do that to an Ignitor. Not impossible, perhaps, but harder. - Seth Emerson