While I was having a clean out at home, I found my original dyno electronics, if anyone wants to build their own. I replaced it years ago with the Performance Trends Datamite. It is very basic, DOS based and uses an ISA card with a Hall effect switch to time the drum or flywheel. Comes with a couple of 386 computers (remember them?). I had 2 systems (I can't remember if one was faulty) and they cost over $800 each in the 90s.
Yours in exchange for beer.
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