RealWheels Corporation’s LED Tire Watch system provides a quick and easy visual inspection of each tire, alerting the driver or maintenance personnel of pressure variations with a bright red LED light. The systems includes simple to install, stainless steel, self-calibrating LED valve caps that memorize desired pressure when initially installed. The cap starts flashing red if the tire pressure drops as little as 4 psi; 8 psi for trucks. The LED Tire Watch system comes in 6-wheel and 10-wheel kits.