What role did the aftermarket scene play in the adoption of speedometers during the early 1900s?

Answer

High demand from drivers installing their own units pressured manufacturers to make them standard

Before manufacturers began fitting speedometers as standard factory equipment, many early car owners purchased these devices independently and installed them themselves or had local mechanics perform the work. This aftermarket activity was driven by the acute necessity felt by drivers to monitor their own speed. The visible demand for these instruments among owners signaled to manufacturers that drivers considered this feature essential, which ultimately accelerated the transition of the speedometer from a niche, optional add-on to a standard requirement across the industry.

What role did the aftermarket scene play in the adoption of speedometers during the early 1900s?
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