This document describes a proposed mechatronic system to guide drivers of manual transmission vehicles to select the proper gears. The system uses infrared sensors mounted in an assembly unit to detect the position of the gear stick. A microcontroller processes this sensor data and displays the current gear on an LCD screen. The goal is to educate drivers, especially novices, to shift gears appropriately according to speed to improve fuel efficiency. The low-cost add-on unit could be installed externally on existing vehicles without modifying the transmission.