Stop in for a cup of coffee

71340Duster said
Popular Mechanics

If this link works page 148-151 were interesting to me, I'll bet Hoppy has those meters!

A Heathkit would be so cool. Wish they still made them. I'm ready to learn - now. LOL.
I think someone on moparts had a CO meter that he was working on. That's still the best way to measure afr at idle IMO