Note: These meters are stepper motors, and the pointer can be reset to zero after connecting to a power source. It is normal if the pointer of the product you received does not return to zero. (You can check the video introduction on the detail page, thank you) 52mm Water temp gauge Oil temp Oil preure Boost gauge bar psi Vacuum Voltmeter Tachometer RPM EGT AFR Car meter + Gauge Pod 1. Boost gauge 2bar/3bar Fitment: For all 12V CARSPackage include:1 x Turbo Boost Gauge(-1-0-2BAR)/(-1-0-3bar)1 x Nylon Preure Line(2m) With One Adaptor1 x Users Manual In English 2. Boost gauge psi Fitment: For all 12V CARSPackage include:1 x Turbo Boost Gauge(0-30In.Hg,0-35PSI)1 x Nylon Preure Line(1.84m) With One Adaptor1 x English Manual 3. Water temp gauge Fitment: For all 12V CARSPackage include:1 x Water Temp Gauge(40-140 Degrees celsius 1 x English Instruction1 x Water temp sensor(1/8NPT) 4. Oil temp gauge Fitment: For all 12V CARSPackage include:1 x Oil Temp Gauge(40-140Degrees celsius1 x English Instruction1 x Oil temp sensor(1/8NPT) 5. Oil pre gauge(psi) Fitment: For all 12V CARSPackage include:1 x Oil Pre Gauge(0-100PSI)1 x Oil Pre Sensor(NPT1/8)1 x Users Manual In English 6. Voltmeter Fitment:For all 12V CARSPackage include:1 x Voltmeter(8-18V)1 x Users Manual In English 7. Air fuel ratio gauge Fitment: All 12Volt CarPackage include:1 x Air/Fuel Gauge(Not include Oxygen Sensor1 x Users Manual In English 8. Exhaust gas temp gauge Fitment: All 12Volt CarPackage include:1 x EGT Exhaust Gas Temp Gauge300-1300 Degrees celsius 1 x Exhaust temp sensor1 x Users Manual In English 9. Tachometer RPM Gauge Fitment: 12volt, 4,6,8 cylinder, gasoline carPackage include :1 x Tachometer Gauge0-10000RPM1 x Users Manual In English 10. Vacuum Gauge Fitment: All 12Volt CarPackage include :1 x Vacuum Gauge1 x Users Manual In English