An instrument that automatically measures and displays a quantity without requiring manual adjustment or reading.
From Greek 'auto-' (self) combined with 'gauge' (a measuring instrument). The prefix indicates the device measures itself automatically, evolving in the early 20th century as automation technology developed.
Before digital displays, autogauges revolutionized vehicle dashboards by letting drivers instantly see fuel, temperature, and pressure without stopping to check a manual gauge—a small innovation that made driving much safer.
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