This broadband probe allows you to know the air/fuel ratio of your engine. This parameter is very important to optimize engine performance and ensure its longevity: Running too rich can decrease your performance and running too poor can generate very high temperatures and damage your engine. This kit is equipped with a Bosch 4.9LSU probe and does not require any calibration during assembly. This probe is very fast, ultra accurate, stable and consumes little energy. It transmits its signal to a pressure gauge that displays the richness on a digital screen. The 0-5 Volt output of this probe can be connected directly to the engine management box. The kit includes: - Manometer 52 mm - Bosch probe 4.9LSU - Probe holder to be soldered on the exhaust (M18x1.50) - Black and white background for the pressure gauge - white and black pressure gauge covers - Electrical harnesses and wiring - Assembly instructions