Volvo 2007 S80 Owner's Manual page 61

The information displays
computer and messages. The information is shown with text and symbols.
More detailed information can be found in the descriptions of the functions that use the information displays.
Gauges
Speedometer
Fuel gauge, see also the section on refueling beginning on
The tachometer shows engine speed in thousands of revolutions per minute (rpm). Do not drive continuously with
the needle in the red area of the gauge. The engine management system will automatically prevent excessively high
engines speeds. This will be noticeable as a pronounced unevenness in engine speed.
Indicator, information, and warning symbols
Indicator and information symbols
show information on some of the vehicle's functions, such as cruise control, the trip
page 175.