Chevrolet Camaro 2024 Owner's Manual page 7

6 Instruments and Controls
This gauge indicates vacuum during light to
moderate throttle and boost under heavier
throttle.
It displays the air pressure level in the
intake manifold before it enters the engine's
combustion chamber.
The gauge is automatically centered at zero
every time the engine is started. Actual
vacuum or boost is displayed from this zero
point. Changes in ambient pressure, such as
driving in mountains and changing weather,
will slightly change the zero reading.