The tachometer indicates the approximate number of engine revolutions per minute (rpm).
Use the tachometer to select the correct shift points and to prevent lugging and/or over-revving the engine.
CAUTION - Red zone
Do not operate the engine within the tachometer's RED ZONE. This may cause severe engine damage.
Other features
Fuel economy auto reset
...
Limitations of the system
The SCC may have limits to its ability to detect distance to the vehicle ahead
due to road and traffic conditions. ...