Types
A tell-tale can convey different kinds of information. It lights or blinks to indicate a failure (as of oil pressure, engine temperature control, charging current, etc.); lighting and blinking indicate progression from warning to failure indication. It lights to alert the need for specific service after a certain amount of time or distance has elapsed. It also lights to indicate a condition of readiness. A "closed-circuit tell-tale" lights to indicate a device or system that has been switched on, while an "operating tell-tale" lights to indicate a device or system which is operating correctly.
Read more about this topic: Tell-tale (automotive)
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