A FMU (FUEL MANAGEMENT UNIT) WORKS IN THE SAME WAY YOUR ECU (ENGINE CONTROL UNIT) WORKS, CONSTANTLY MONITORING HOW THE ENGINES RUNNING AND ADDING FUEL TO GO WITH THE EXTRA BOOST,
THE FUEL REGULATOR WORKS FOR THE BOOST PRESSURE ITS SELF AS THE BOOST PRESSURE INCREASES SO DOES THE FUEL.
SO IN SORT YES YOU CAN JUST USE THE REGULATOR.