Idiot Light
Definition:
A derogatory term for an instrument panel warning light. They're called idiot lights because they're for idiots who don't know how to read or understand gauges. Actually they're not all bad. An idiot light won't give you any indication that a problem is developing until it happens. On the other hand, a light commands more immediate attention than a gauge. The "ultimate" instrumentation should include both: gauges to give an accurate indication of coolant temperature, oil pressure and charging current, and lights to catch the driver's attention when readings approach the "danger zone."
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