When looking closely at the black 1954 Chevrolet speedometer face, a small 1/8 inch diameter round hole will be noticed at the top and bottom.
Owners of 1954 trucks will always be acquainted with the top hole. This emits red light to notify the driver that the high beams are on.
Most are not even aware of the existence of this lower hole. Look closely. It's always on the 1954! It is placed there to emit a flashing green light when the optional turn signals are added. Prior to this model, the GM trucks add-on turn signal head was clamped to the steering column. With the turn signal on, a small light would blink in the head.
In 1954, the optional turn signals became 'built-in' the column below the steering wheel. The blinker light became a part of the dash like later vehicles.
When the factory or the dealer added optional 1954 turn signals, the little hole with green tape inside was ready for the new dash bulb. This one flasher light would blink if the signal was to the right or left.
