Yeah, mine is a complete design of my own. I can't recall the timing performance of interrupts, but I like the simplicity of the 4 flying magnet as opposed to dealing with the 36-1 or 60-2 wheels. The advantage fo the 4 flying magnets is I can trigger my existing ignition off it while I find time to deal with the programming side of driving that signal off my board.

I dislike the idea of having to space all my pulleys out to accomodate the MSD wheel. I'll have to look at what my options are when I get a free evening to spend at the car dreaming and scheming.

Greg