0-50 PSI for use with 1994-2003 Ford 7.3L and 2001-2005 GM 6.6L Key Features: Superior Precision and Durability Easy-to-Read DynaFact Gauge Monitor turbocharger performance Dynamically indicates boost output Allows driver to target ideal boost setting 1-Year Limited Warranty Range: 0-50 psi 2-1/16 inch diameter (52.4mm) CARB E.O. Not Required