You're on the motorway in an old turbo saloon and something lights up on the dash. Read the lights, the gauges and the message, work out what's wrong, and decide: pull over now, get it seen to soon, or nothing to worry about.
Turn the key to start.
Red means stop: something serious, or a safety system that isn't working. Pull over as soon as it's safe. Amber means check soon: a fault, or a system that switched itself off; you can usually drive on carefully to a garage. Green and blue are just information: something is on. And look at the gauges too: a light tells you what, the gauges often tell you how bad.
Flashing is worse than steady. A steady engine light means "have the code read soon"; a flashing one means the engine is misfiring hard right now.
The night panel button turns off every instrument except the speedometer, for driving in the dark without a lit-up dash. The gauges come back by themselves when something is off: the temperature climbing, the fuel low, the boost too high. The warning lights always stay on.
It's the general rule for most cars, simplified for a game. Your own car's handbook has the final word on what each light means, and a garage can read the actual fault code. When in doubt about a red light, stop. For more things with lights on them, look at the SID or the switch.
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