Lang Fuel Injection Cleaner 2 Gauges Description: Lang fuel injection cleaner with 2 Gauges features two gauges to enable a technician to 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. The Lang Fuel Injection Cleaner cleans carbon from intake valves, fuel passages, and cylinders with a professional carbon cleaning solution, which will restore the original spray pattern more effectively, giving improved performance, fuel economy, and emission tests. Both gauges are 2 1/4” and have dual scale dials with ranges from 0-100 PSI and 0-7 bar.