I was reading the software setup manual, and the "Go EFI" units have a Pulse Width Modulated fuel pump driver, but it looks like it does not monitor the fuel pressure, it looks a user pre-set TPS and RPM values, that if the engine is under the specified RPM or TPS value, then the pump drivers applies a user defined PWM percentage to set the pump for a lower flow rate.

On my Coronet (Edelbrock XT EFI), I am running -6 AN hose supply and return, except for about 6" to/from the Spectra EFI fuel tank that uses 3/8" supply and 5/16" return. It only has a 225 LPH pump, but I think the line sizes would be fine even with a larger pump.

Also, they have a $100 rebate going on for the FiTech units