2005 Saturn Ion Owner's Manual - Page 147

Boost Gage 4,400 rpm, the middle pair of lights is 5,600 rpm, and the top pair of lights is 6,200 rpm. These settings can be adjusted by turning the stem behind each light. To have the light come on at a higher rpm level, turn the stem counterclockwise. To have the light come on at a lower rpm level, turn the stem clockwise. Each turn adjusts the settings by 100 rpm. To restore the default settings, press and hold any stem for three seconds. The lights will flash three times. To turn the lights off or on, press and release any stem. Message Center United States Canada If your vehicle is equipped with this gage, it is located on the steering column. This gage indicates vacuum during light to moderate throttle and boost under heavier throttle. The gage displays the air pressure level going into the engine's combustion chamber. The gage is automatically centered at zero every time the ignition is turned to RUN. Actual vacuum or boost is displayed from this zero point. The boost gage is also equipped with three pairs of lights that are located on each side of the gage. These lights are used to indicate three different engine rpm levels. The default setting for the lower pair of lights is 3-39 The message center is located in the instrument panel cluster. It gives you important safety and maintenance facts. If there are several messages, each message will be shown for a few seconds and will continue to repeat until cleared. To clear a message, press the trip/reset button while the message you want to clear is being displayed. Many messages will also cause a chime to sound, to alert you to the message.