With the boost-a-pump, you just hook it up to the power supply, the stock fuel pump control unit still modulates the "ground" seen by the pump for cruise and idle conditions. Also the boost-a-pump comes with a hobbs switch that is used to turn on the boost-a-pump only when on boost. If setup this way, the entire fuel system is exactly like stock when not on boost, and the voltage to the pump ramps up only when on boost...