I'd suggest tapping into the power wire to the 1st fuel pump. The only downside to this is that your 2nd fuel pump will run at 12 volts full time. It'd be nice if they made a relay that triggered at 12 volts but not at 9 volts...Trump said:I am installing the PHR stage one fuel kit which uses the stock supra pump and a walbro pump. What wire in the fuel pump harness do I tap into to trigger the relay to turn on the walbro? Any help would be appreciated!