Cadillac 1967 VVI Data Book page 156

CAUTION: Do not use the automatic feature when
conditions do not warrant maintaining a constant speed,
such as in moderate to heavy traffic, or on winding or
slippery roads. Under these conditions, the system should
be turned off. The speed reminder feature can be retained
if the switch is reset to the "ON" position.
When the unit is in automatic control, car speed can be
changed by slowly rotating the dial forward to increase
speed, or backward to decrease speed.
CAUTION: When changing speed during automatic
control, the dial acts as a hand throttle. Always rotate
dial slowly to prevent sudden acceleration.
In automatic control also, car speed can be increased by
pressing the accelerator pedal through the warning back
pressure. The car will return to set speed when foot is removed
from accelerator pedal. The throttle control is disengaged
when the brake pejdal is depressed. To re-engage, accelerate
until back pressure is felt. The unit will again engage auto-
matically. It is not necessary to rotate control switch forward
to re-engage automatic control.
To change from automatic control to speed reminder
operation, rotate the control switch to "OFF" and reset
to "ON".
To disengage automatic control or speed reminder opera-
tion, rotate control switch rearward to its stop, which is the
28
"OFF" position. The automatic control is completely dis-
engaged whenever the ignition switch is turned off.
With the unit "OFF", no back pressure will be felt at any
speed and the indicator light will not glow. When automatic
control is disengaged, it is necessary to move the control
switch forward momentarily to the end of its travel to
re-engage.
GUIDE-MATIC POWER HEADLIGHT CONTROL
The Guide-Matic Power Headlight Control (optional at extra
cost) automatically switches the car's headlights from high to
low beam when another vehicle approaches from the opposite
direction, and returns them to high beam again when con-
ditions permit. When driving behind another car at night the
headlights may switch from high to low beam, as Power
Headlight Control is sensitive to the red reflection of the tail
lights of the car ahead.
The foot switch is a special
dimmer-override type that pro-
vides either automatic or lower
beam control of the headlights.
It also contains an override fea-
ture for obtaining an overriding
high beam when in automatic
position, if desired.