That is an EJWard VIT box. We use EJWard at work as our fuel management system. All that box does is comunicate to the companies site pumps, or mobile fueling truck and authorize the pump to turn on and then record which asset took fuel, how much fuel, and the assumed engine hours (it doesn't read the hours, just goes off what was programed at initial install and then adds them based on key on power.) I'm guessing you bought this at auction from a fleet? It will have no bearing on how the tractor runs, trace the wires and remove them. Should be a power, ground, key on, and two wires to a ring antenna near the fuel fill, the ring antenna is the two black wires in grey insulation. Any other questions about that thing feel free to ask!