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AEM's Digital Boost Display Gauges combine unsurpassed accuracy, speed and control with an easy-to-read digital LED interface that displays boost in 1 PSI increments, and a sweeping LED "needle" that lines the edge and moves as boost from 0 to up to 35 PSI. The boost gauge's digital readout will automatically increase and decrease in intensity due to the built in ambient light sensing photocell. Ideal for carbureted or EFI vehicles Easy-to-install Plug & Play harness and sensor included Each gauge comes with interchangeable black/silver bezels and black/white faceplates 0-5V analog output included for use with data loggers and virtually any engine management system Auto-dimming gauge face and read out lighting Brass sensor included Standard 52mm (2-1/16”) gauge housing 30-4406 displays boost from -30 - 35 PSI AEM Digital Oil Pressure Gauges combine unsurpassed accuracy, speed and control with an easy-to-read digital LED interface that displays oil pressure in 1 PSI increments, and a sweeping LED "needle" that lines the edge and moves as oil pressure changes from 0 to 150. The oil pressure gauge's digital readout will automatically increase and decrease in intensity due to the built in ambient light sensing photocell. Ideal for carbureted or EFI vehicles Easy-to-install Plug & Play harness and sensor included 24 green LED display lights provide immediate reference to monitored engine function Each gauge comes with interchangeable black/silver bezels and black/white faceplates 0-5V analog output included for use with data loggers and virtually any engine management system Auto-dimming gauge face and read out lighting 100 PSIg brass sensor included Standard 52mm (2-1/16”) gauge housing