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Originally Posted by cooperino
Very good read and well written explanation.. thank you!
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Anytime! I'm far from an expert on these things, but love to learn from others and share what I've learned. The KT timing thing was especially interesting to me first time I timed one, I couldn't figure out why it wouldn't stay put. Turned out the engine I was working on had one lobe worn worse than the other for whatever reason, and it was a couple degrees different between the two.
Now we just need to get OP his tach working. Inductive pickup works well for hooking up an OScope, but probably doesn't deliver enough of a pulse to drive the tach.
I can't think of any super simple things off the top of my head. Some sort of inductive pickup with a simple pullup circuit to trigger a voltage spike might do it. Probably simpler just to replace the tach, but I know that's not what you're looking for.