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Grady, thanks for the cross-reference!

I actually have two different tach issues that I'm working on:

1) How to make the '66 tach work with a Bosch CDI; and

2) How to make the tach in my '71E work with a Bosch CDI (the tach is actually from a '70 S.

Sherwood, the underlying reason behind all this research is I've been trying to figure out when the tach cutover to low impedance is. That way, I can source a later tach and have it work.

That being said, I'm also working on the substitution of modern tachometer movement and circuit for the original VDO at the suggestion of Pelican 914GT. I have all the parts, just have to spend a few hours fabricating. . .