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HI Dave,
You can link here to an article I wrote several years ago about my 1922 Series 33 that has an illustration of the gas regulator knob as part of the dash panel. Link here: https://pierce-arrow.org/features/feature14/index.php My 1922 has the little bump at the end of the arrow on the knob to make touch adjustment possible. My understanding has always been that Series 32’s were 1921 and Series 33’s are the 1922 production. Of course it’s possible they jumped the model year with late Fall 1921 production of 33’s, but I’ve never heard anything about that one way or another. Sounds like a good article….I’m looking forward to it. Tony Doughty, Walker, MN