follow up spark tachometer

[doug v]

sorry it took me a while to post- didwork ok on the coil-distribtor- showing in the 2800-3000+ range which would make sense if it sparks 2x/rev. Not too accurate on a spark plug wire alone, seemed to no read stable, anywhere from 600-800 (1 every 2 revs) to up to 3000- I was doing it close to the distributor and I think migh thave been getting some interfernce fr other spark plug wires.