By what year had the majority of American-built automobiles begun to include speedometers as standard equipment?

Answer

1904

Following the pioneering adoption of the device in the 1901 Oldsmobile, the automotive industry saw a rapid transition in how speedometers were viewed. By 1904, the majority of American-built vehicles were factory-equipped with these devices. This quick shift, occurring over just a few years, demonstrates how rapidly the perception of the speedometer evolved from a novelty or luxury item into a necessary tool for the driver, driven by the clear benefits of increased control and the ability to measure performance and comply with the emerging need for speed management.

By what year had the majority of American-built automobiles begun to include speedometers as standard equipment?
inventionCarAutomobilespeedometer