Shift Indicator Light
Vehicles with manual transmission have an "upshift" light on the instrument panel. This light is illuminated to indicate optimum shift points throughout the range from optimum fuel economy to optimum performance.
When this light is on, shift transmission to next higher gear range if conditions permit. For fuel economy, accelerate slowly and shift when light goes on. For performance, accelerate as desired and shift when light goes on.
Safe operation of vehicle may require shifting differently than indicated by the "upshift" light to adapt to weather, road and traffic conditions.
Downshifting one or more gears may be required to keep the engine running smoothly or to maintain satisfactory performance.