This Boost Gauge is perfect for any turbocharger, supercharger, and is perfect for cars with a stock turbo; they can replace the inaccurate gauges that are in your car. This gauge is perfect for cars with an upgraded turbo and you can to rely on this accurate gauge. It can read up to 30 PSI and is sufficient for almost all applications including race and drag. These gauges are perfect for those who run a manual boost controller. With just a quick glance, you are able to read the various changes you have made. Severe engine damage is often the result with an improper boost gauge. When you increase boost without properly monitoring the levels of boost, you will often run into trouble. We recommend that you use our Air / Fuel Gauge to monitor the fuel system, so you do not run into any internal problems with the engine.