Why do some speedometers have 2 knobs?

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Model T Ford Forum: Forum 2017: Why do some speedometers have 2 knobs?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Corey Walker, Brownsboro TX on Monday, October 09, 2017 - 04:17 pm:

What are the 2 knobs for on some older speedometers? Mine is a Stewart model 100 and only has one to set the trip odometer


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