This ROUSH® gauge will allow you to monitor the vacuum/boost of your ROUSHcharged™, supercharged, or turbocharged engine, while adding a real race-quality feel to the inside of your ride. The gauge reads from -30 to 20 lbs. of boost and features a white face. The gauge is 2 1/16" in diameter. The package includes vacuum/boost tubing, fitings, and hardware.