Air pressure sensors remain an expensive and dedicated brand of product. They are built in to some luxury vehicles, and the repairing process is also costly. The aim of this study is to develop a cost-effective air pressure sensor that can be used in domestic applications. The unit includes a pressure gauge, Light-Emitting Diode (LED), Light-Dependent Resistor (LDR), and a few circuit wires. The concept of a night sensor mode was used in the development. Three pressure levels were identified, namely, low, correct, and high, with values of 28psi, 32psi, and 35psi, respectively. Based on the pressure variations, LED and LDR were installed and connected. The device was linked to the tire pressure measurements. In practice, air pressure is measured normally. When the air pressure is decreasing, the LED fixed on the 28psi value by the pointer closes, the shadow created by the LDR is taken as the input, and the signal is given to the control panel that the tire pressure is low. Similarly, the other two pressures are also measured by the sensor unit. All the devices were fitted with heat sleeving at the required places to reduce the unit's errors. A power adapter is used to provide power to the system. The results obtained using the developed system can be used in automotive applications where tire pressure can be a major issue. An experimental setup was evaluated using an automatic tire inflation system. The temperature variation may lead to limitations, and accuracy issues may occur if the unit is not temperature-compensated or is not in a controlled environment. The further improvement would require the unit to be free of errors in terms of calibration and other extraneous factors.