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Go to the "Feature Archive" of this site and scroll down to the "1922 Series 33 Owner’s and Driver’s Report". In the article there is a photo of the dash showing the gas regulator which is the knob with the arrow on it located second from the left on the bottom. It’s purpose is to permit the driver to fine tune the carburator mixture while underway. You can see the knob identified on p. 32 of the parts manual but the rest of the assembly is not detailed there. If you plan to be in Lexington, I’ll have my car there and you can see the whole assembly. The knob runs a wire to the part on the caruretor identified as "U" in Fig. 1 on p.3 of the 1977 PAS Service Bulletin Issue #6. Hope this helps.