Porsche 928 GTS 1994 Owner's Manual page 53

To change the preset cruising speed
Increase preset speed:
Accelerate by depressing the accelerator pedal.
When the desired speed is reached push lever
toward instrument cluster (arrow 1) and take
your foot off the accelerator pedal. Now the new
cruising speed is set and stored in the memory.
As an alternative, you can hold the lever in the
front position (arrow 1), without depressing the
accelerator pedal. The car will accelerate on its
own. When the desired speed is reached, re-
lease the lever.
Decrease preset speed:
Apply the brake, which will disengage the auto-
matic speed control. When the vehicle has
slowed down to the desired speed, push lever
toward instrument cluster (arrow 1) to set the
new cruising speed.
As an alternative, disengage the automatic
speed control by moving the lever toward you
(arrow 3). When the vehicle has slowed down to
the desired speed, push lever toward instrument
cluster (arrow 1) to register the new cruising
speed in the memory.
Note: When driving up a hill, if the engine power
is insufficient in a particular gear, the speed con-
trol will be disengaged automatically. Shift to a
lower gear to avoid lugging the engine.
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