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§ 25.1549 - Powerplant and auxiliary power unit instruments.

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For each required powerplant and auxiliary power unit instrument, as appropriate to the type of instrument—

Each maximum and, if applicable, minimum safe operating limit must be marked with a red radial or a red line;

Each normal operating range must be marked with a green arc or green line, not extending beyond the maximum and minimum safe limits;

Each takeoff and precautionary range must be marked with a yellow arc or a yellow line; and

Each engine, auxiliary power unit, or propeller speed range that is restricted because of excessive vibration stresses must be marked with red arcs or red lines.

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§ 25.1547 - Magnetic direction indicator.
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§ 25.1551 - Oil quantity indication.