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Autometer ES 52mm Full Sweep Electric 0-1600 PSI Nitrous Pressure Gauge Final Drive Gears GM LS7 Gen-4 Small BlockProper 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