I'm adding a second FPMD and new wires to the second fuel pump. When I looked at the new plug I can see the wires were twisted pair and shielded. Is this necessary? Did they do it for the radio or for the fuel pumps? Without cutting my harness apart I have no idea how far they run twisted and shielded. I'm guessing it has something to do with pulse width modulation. I might keep it that way vs. return fuel. I also have an amp and system in the trunk.