Transfer Flow's 40-gal in-bed Auxiliary Fuel Tank System is compatible with almost any full size diesel truck. It operates using Transfer Flow's TRAX 3 technology. Fuel is pumped from the auxiliary tank to the main tank at pre-determined fuel levels while the vehicle is in operation. The system includes a dash-mounted LCD display that shows the percentage of fuel in each tank. The tank is manufactured from American-made 14-gauge aluminized steel and is powder coated for a durable satin black finish. Comes complete with all parts needed for installation.