Autometer Phantom II Nitrous Pressure 2 5/8in 1600 psi Stepper Motor Gauge with Peak and WarningProper Nitrous Pressure Is The Difference Between Extracting Maximum Power From Your Engine And Finishing Second. Autometers Digital Stepper Motor Nitrous Pressure Gauge Uses Our Advanced 1 8" Npt Solid State Pressure Transducer To Give You The Most Precise Possible Reading Of Your System Pressure ,Up To 1600 Psi. Built With The Accuracy And Durability Required By The Professional Racer, There Simply Isnt A Better Possible Solution. A Direct Plug In