I have spent 60 years at auto race tracks, watching, spannering, driving, holding out pit boards, waving flags. Also rallying: driving, navigating, marshalling, mechanicing, organising, watching. All but the first 10 years as a teen and pre-teen with no watch at all was with a chronograph on my wrist and I have never found a use for a tachy scale in any of these activities.
There is just one use I can think of for a tachy scale at a race track -- the special watches that Heuer made for the Indianapolis track where the readout was in mph for a full lap.
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