These are really neat, but usually quite expensive. You connect a vacuum line to a vacuum switch which works off the brake pedal, then to the intake manifold. When the pedal is pushed the vacuum is sent back to the light, which had a vacuum motor to swing the light left and right. I have one that I'll connect to my Model A someday. I'm not sure who made these old lights, but they are often called "Studebaker Wig-Wag".
https://minneapolis.craigslist.org/h...331787718.html
https://minneapolis.craigslist.org/h...331787718.html
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