Quiz: What is the significance of the ‘redline’ on a vehicle’s tac April 28, 2025 by Alex Turner What is the significance of the ‘redline’ on a vehicle’s tachometer? Discover more about Vehicle Engine and Automobile at our home page. A) It indicates the maximum safe engine RPM before potential damage. B) It shows the ideal fuel efficiency range for the vehicle. C) It represents the minimum engine RPM required for optimal performance. D) It denotes the recommended oil change interval. Submit Answer