Outfit your semi truck to be Ready for the Road Ahead with the exact amount of tire pressure needed, with the Hendrickson Tiremaax Delphi Connector Pro Controller Assembly. This portable controller allows operators to maintain the ideal tire pressure for vehicles journeying through a number of conditions. Engineered with a pressure-resilient design, and paired with an air pressure gauge and safety release valve. FleetPride is your First Click in Heavy Duty .