Chevrolet 2008 T Series Owner's Manual page 111

Air Pressure Gage
If the needle on the gage indicates that the air pressure
is below 60 psi (415 kPa), the low air warning light
will come on. An alarm will also sound if this happens.
The bottom yellow pointer shows the pressure
available for the front secondary system, while the
top white pointer shows pressure for the rear primary
system. There should be no more than 4 psi (28 kPa)
difference showing between the systems.
Don't drive until both pointers are showing at least
120 psi (827 kPa), so you'll have enough air if you need
to apply your brakes.
If your vehicle has air
brakes, this gage shows
the air pressure for
both your front and
rear brake systems.
Hourmeter Gage
To access the engine hourmeter gage press the trip
odometer button three times.
The instrument panel cluster displays the accumulated
engine run time hours using the reconfigurable odometer
display. The engine run time hours displays only when
the ignition is in the LOCK/OFF or ACC/ACCESSORY
position and the trip reset switch is pressed for about
four seconds.
When the ignition is in the LOCK/OFF or
ACC/ACCESSORY position, the instrument panel
cluster displays the engine accumulated hours for up
to 30 seconds. The value of the accumulated hours does
not change when the battery is disconnected.
The hourmeter resets to 0.0 when 10,000 hours are
accumulated. The instrument panel cluster begins to
reaccumulate the engine run time hours from 0.0 hours.
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