That little arrow on your dashboard that points either left or right, tells you which side of your gas tank is on. It’s such a simple design, and it even has a name, The Moylan Arrow, named after the engineer, Jim Moylan.
“I would like to propose a small addition,” he wrote, “in all passenger car and truck lines.”
The proposal he had in mind was a symbol on the dashboard that would tell drivers which side of the car the gas tank was on.
“Based on personal experience,” he wrote, “I feel that this little indicator would remove the guesswork of which side I want to park.” He continued: “For the minor investment involved on the company’s part, I think it would be a worthwhile convenience.”
Very soon, everything became a standard design feature in nearly every car