Yes it is very easy to do it yourself and you just need a 40A relay, a 25A fuse with holder ,some connectors and wire rated for about 20 - 25A(4 mm2 wire is good). Take + and - supply from battery and put the fuse to the + wire as close you can to the battery and then connect the - wire directly to the pump and the + to the relay power contact. From the relay power contact connect to the pump and drive the relay with the existing pump feed wires. Ideal place for the relay is inside the spare wheel area next to fuel pump inertia switch...