Porsche 928 ST1991 Owner's Manual page 42

Selectable on-board-computer and auxiliary functions
When the ignition is switched on, the following appear:
Display, left: odometer reading
With the ignition on, the on-board-computer and auxiliary functions below can be called up in turn with the aid of the information-system
control lever. The letters, digits and symbols for all the function displays are orange. Any messages concerning faults occurring simultane-
ously in the car will appear in red. Once the ignition is switched off, the last function selected is displayed until the central locking system
is activated, or for a period not longer than 4 minutes.
On-board-computer functions
Press the control lever forwards to enter the on-board-computer selection mode.
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Display, centre: last on-board-computer
function selected
The function selected appears in the centre
display. Worded messages appear on the
left and right. Push the lever up to select the
next function; pushing the lever down calls
up the previous function. The worded mes-
sages are cancelled when the lever is pulled,
or automatically after 4 minutes.
After this, the auxiliary functions reappear in
the left and right displays.
American measuring units will be changed
into metric units by pulling the lever twice
within 1 second (this applies only for U.S.
specified vehicles).
Display, right: tripmeter I reading
Pull control lever for 3 seconds to reset.
Range calculated on the basis of fuel left
in tank, present consumption and average
consumption.
Reading between -40° and +140° F. (-40°
and + 60° C). The outside temperature
display is not an ice warning!
Pull control lever for 3 seconds to reset.