XtremepowerUS Oil Pressure Tester Gauge Engine Diagnostic Test Kit 3" Diameter Oil Pressure Gauge calibrated in PSI or Bar with protective rubber boot Includes 100 PSI Rated 24" long rubber hoses with brass fittings, Typical engine oil pressure expected readings for hundreds of engines and car makes/models blow molded case included adapters size: 1/8", 1/4", 3/8"