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I have a friend who has an automotive coil tester made by Koiltester. I attached some photos. Anyone have any idea where a manual or electrical diagram might be found? Thanks, Sanford

I have a vintage (1937 or so) King Spark Plug Tester. It's a model K-3. Does anyone have instructions on how to use it? It has 3 holes to put the plugs into (3 different sizes); a voltage control, a wire to attach to the plug being tested and a meter with 3 different "shorted" indicators -...