Porsche 911 Carrera Manual page 94

Starting the timing
f Push operating lever forward.
The selection field is switched on.
f Select CHRONO with the operating lever.
f Push operating lever forward.
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Controls, Instruments
f Push operating lever forward.
The time runs on all stopwatch displays.
The on-board computer display changes to the
"Stop timing/Intermediate time" selection.
PCM information
The performance display in the "Trip/Sport dis-
play/Begin trip" menu must be selected in order to
analyse the data in the PCM.
Stopping the timing
After time measurement is started, the on-board
computer display changes to the "Stop timing/In-
termediate time".
f Select "Stop timing" with the operating lever.
f Push lever forward.
The time is stopped in all stopwatch displays,
and the on-board computer display changes to
the "Continue/Reset" selection.
The timing can be continued or reset to zero.
PCM information
After timing has been stopped, a prompt asking
whether the time is to be stored appears on the
PCM.