This Electrical Boost Gauge will perform a pointer sweep/self check on start-up & shut down! If your vehicle is supercharged or turbocharged then this gauge is simply a must have. For peak performance you need to know how much boost you are making at maximum RPM's. Save your Turbo-Set the warning function to alert you when you over boost!!   -30~45 PSI Range Includes Mounting Base Silicone Tubing kit T-Adaptor Waterproof Electric Sender Quick connect pigtail wiring Decal Instructions