It might not of worked out properly and was discontinued......
Here is a paragraph from a 1960 Buick Chassis Manual ;
Guide- Matic Power Headlight Control
The Guide-Matic consists of a phototube unit, amplifier unit and a
combination over ride and dimmer switch.
The phototube unit picks up light from an approaching car and sends it
to the amplifier unit. The amplifier unit, in response to a signal from
the phototube unit, operates the power relay which switches the
headlamps from high to low beam. It also applies voltage to the
The phototube unit has a sensitivity control knob which allows the
driver a limited amount of control of the sensitivity of the phototube
unit. The knob has "Far " and " Near" at the extreme ends of the
adjustment range and a detent position midway in the range for the
normal setting. Adjustment toward the FAR setting increases the
sensitivity of the unit. Adjustment toward the NEAR position decreases
the sensitivity of the unit.
The courtesy salute section of the Guide-Matic is an added feature which
switches the headlamps from upper to lower beams in a two step action.
When The headlamps are switched to lower beam, the upper beam will
remain on at a reduced candlepower for approximately one second, which
indicates the car is equipped with a Guide-Matic.
There are 6 pages covering the Guide-Matic. It seemed like a complex
option. The test unit was a Kent - Moore J-8465
Verticle Aim and Intensity control were two of the adjustments that
could be made.
The Amplifier was monuted to the Left hand side of the kick panel, just
above the height of the lower door hinge.
IMPORTANT; Phototube & Amplifier assembly must be maintained as a
matched set at assembly & are identified by identical serial numbers.
1991 Pontiac Bonneville LE
3800 V6 ( C ), Black/Slate Grey
_~_~_~_~277, 300 miles_~_~_ ~_~_