This project is developed for the users to display the heat of the engine and to produce over heat alarm. It mainly consists of a petrol engine and electronic parts. The petrol engine consists of a cylinder and piston arrangement, carburetor, petrol tank and induction coil. A heat sensor is connected with the engine. The sensor senses the heat and sends signal to a microcontroller. The microcontroller analyses the signal and sends signal to the LCD display. The display displays the temperature of the engine. If the heat exceeds a particular limit, the microcontroller sends signal to a buzzer through driver unit. Thus the user can identify the status of the engine and can switch off the engine. This prevents the engine from unnecessary burning. Since microcontroller is used, the operations are very sensitive. Since LCD display is used, the user can know the correct temperature of the engine