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This research aims to design and develop a data monitoring and acquisition system of an onboard and wireless data telemetry system for electric vehicle. The scopes of this research are sensor integrations (6DOF IMU sensor and voltage sensor), creating a Graphical User Interface (GUI) for onboard monitoring system, conducting tests on data acquired by systems and connection's durability testing for the developed systems. The onboard system consists of Arduino Uno, sensors, a serial communication module, LCD display and a memory card which is fitted onto RC car for data recording. The data is transmitted to the wireless system via radio frequency through the serial communication module. The wireless system consisting of Arduino Uno and a serial communication module are connected to a laptop. The data collected from both systems are compared to ensure minimal data losses. It is found that there are no data losses between the data transmitted and received. As an outcome from this research, a telemetry system has been developed to be used on RC cars.