If your vehicle has this gage, it is located on the steering column.

This gage indicates vacuum during light to moderate throttle and boost under heavier throttle.

This gage displays the air pressure level in the intake manifold before it enters the engine's combustion chamber.

This 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 has 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 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 pair come on at a higher rpm level, turn the stem counterclockwise. To have the light pair come on at a lower rpm level, turn the stem clockwise. Each detent 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.