Lang Tools TU-470B Fuel Injection Cleaner Cleans carbon from intake valves, fuel passages, and cylinders with a professional cleaning solution Helps restore the original spray pattern more effectively, giving improved performance, fuel economy, and emission tests Features two 2-1/2" gauges with dual scale dials from 0-100 PSI and 0-7 bar Check the vehicle fuel pressure with the bottom gauge, and then easily set cleaning pressure with the top gauge by referring to vehicle fuel pressure on the bottom gauge