There are many aspects involved when investigating a machines performance and health. This is especially true for something as critical to the industry as an engines turbocharger. One component of turbocharger health is mechanical vibration. Vibration can be defined as oscillations about an equilibrium point. So, any piece of rotating equipment will exhibit oscillations uniquely its own than can be measured and analyzed by vibration spectrum data. However, there is much more to vibration than just gathering data. This paper will cover the basics of how an electrical signal gets transformed into useful information, and how that information can be used to monitor and diagnose turbocharger health. The material in the paper explains how to properly use a vibration severity chart and use frequency spectra data as a diagnostic tool. The information in the paper will include real-life data from operating turbochargers.