I run two pumps. NX Titan system requires 10.5 psi of fuel if I use 500-750 HP jetting. Right now I'm running 300 HP jetting for initial nitrous runs/tuning and I have my N2O pressure reg set at 9.5 with the engine fuel log seeing 8 psi from it's own dedicated pump. I run a sumped stock tank with -10AN fittings to two Edelbrock 160 GPH pumps (#1792) where I run braided line over the rear suspension to a custom frame mounted steel bulkhead bracket where I switch to 1/2" aluminum lines with a 100 micron filter for fuel, a 7 micron filter for the N2O fuel supply, then up to each regulator, then it's -8AN to the fuel log and -06AN braided to my fuel solenoid. My timing retard lead from my Mallory HyFire VI box is wired parallel with my +12V activation for the fuel solenoid so everything happen instantly and consistently. My plate has a large jets on the center bar with orifices facing away from each other with smaller jetting on the outer bars facing towards the intake and on the opposite end of the plate is the N20 inlet with similar jetting/layout. For reasons of N20 and fuel distribution with such a potentially large shot on demand, a larger fuel pressure is required for this above what is required for the engine. So depending on application, two separate, dedicated fuel pumps should be used.
