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In 1991, I introduced the J&S SafeGuard Individual Cylinder Knock Controller to the aftermarket. About twenty years before MoTeC had it.

Shirley died from cancer three months ago, but I’m still at it, working on an ion sensing version now. I had to set it aside the last three years while I cared for her.

I was going through the photos on her phone after she died and found a video she made in 2016, before she got sick. She was recording my first bench test of the ion system. Her voice is a little hard to hear over the ignition noise, but if you listen closely at the end, you can hear her say “What a man, what a man.”
https://youtu.be/u0b3mFWPIqI

I later incorporated all that clutter into an Ignition Test board. You can see it here where I test the new J&S Vampire:
https://youtu.be/u0b3mFWPIqI