If in daylight, if buzzer goes off, hold hand over lights to shade enough to read which one is lit.
The systems I set up use a buzzer only, for simplicity and reliability. If buzzer goes off it is due to one of the following: Low oil pressure, high coolant temp in one of a couple places, high exhaust temp. A gauge scan, check exhaust water flow, a dive in the engine room will identify the issue. Which is what you would do with the lights, anyway.
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