Ideal for carbureted or EFI vehiclesAdjustable backlighting via a dial on the back of the gaugeIncludes black and silver interchangeable bezels and white and black faceplates320 degree viewing area for unsurpassed resolutionBoost gauge includes high quality sensor - everything you need to install it!Easy-to-install harness0-5v analog output included for use with data loggers and virtually any engine management systemElectronic stepper motor needleStandard 52mm (2-1/16”) gauge housing30-5132 displays -30 - 35 PSI of boost20-5137 displays 0 - 60 PSI of boost30-5137M displays 0 - 4.1 BAR of boost