52mm [2-1/16 in.] Dia. Gauge Body,Bosch LSU 4.9 Wideband O2 Sensor,Patented DirectDigital Wideband Sensor Control,3-Configurable Analog Outputs,Four-In-One Ethanol Content- Fuel Temp- Fuel Press.- Wideband AFR,Pressure Readings Can Be Adjusted For Altitude Differences,Warning Indicator LED When Actual Boost Exceeds Target,Interchangeable Bezels- Black and Silver Included,OLED Configurable Display[One- Two or Four Channel Viewing Mode],Interchangeable Faceplates- Black and White Included,Boost Vision- Real-Time Calculated Approx. Of ECUs Boost Limit,4 BAR MAP Sensor- Pressure Range: -29inHG to 43.5PSI- -1 to 3 BAR