Engineers have considered many aspects on designing a car behavior before launching it, based on certain customer market. Different manufacture may have different concerns. Moreover, the longer being used, the performance may degrade as well. These two aspects are not visible to user except the one available on dashboard. Thus, judging car conditions is mostly done based on user feelings, which is subjective measurement and varies among human. For that purpose, this paper proposes vehicle monitoring system with quantitative measurement to provide consistent measurement. The measurement focuses on two observations; vehicle internal condition through OBD-II interface, and passenger comfort based on standalone sensors. The monitoring results can be used for prospective buyer and for performance monitoring from time to time. In order to provide a stylish look with comprehensive information, a comprehensive digital instrumentation cluster with flutter framework is proposed. Finally, the monitoring on real riding is provided and summarized at the end.