A performance monitor is a type of tuner you can find online. For sure, this device does everything your vehicle gauges do and more. From measuring pressure to temperature to exhaust gases, a performance monitor is so reliable. A certain caliber of monitors can do performance tests on your truck and produce readings about horsepower, torque, MPG, and more. A performance monitor can let you track your o-60 and 18/mile times. Simply push a button to decide the gauges you want to track and the data you want to read. If you get the most advanced performance monitor, it will teach you how to control your driving habits to save on fuel. We have reviewed some touch-screen monitors above.