The Innovate Motorsports DB gauges are 52mm (2 1/16) air fuel gauges. Each gauge features a bright LED display (available in blue, green, or red). For tuners seeking the most cost-effective way to start monitoring Air/Fuel Ratio, the DB series gauges offer an attractive display option for the LC-1, LC-2, LM-1, or LM-2 lambda controller kits.Installation InstructionsThese kits includes the DB Gauge, mounting hardware, and quick-start guide.