Color is not claimed as a feature of the mark.
The mark consists of Two turbochargers for a diesel engine in a symmetrical "yin/yang" orientation, representing two vinyl records or reels of tape, black and white only. Blowers are oriented so that the leftmost turbo is pointing up, the rightmost is pointing down. Mark may or may not include words "Diesel Gang" in all caps using a stylized font as part of the two circular designs, one word per circle, each one as curved text around the top of each turbocharger graphic. Sometimes the words are used horizontally under the graphic.