Who here has installed one of these and can walk me through the process? Just sent my injectors out to get flow tested and cleaned once i get them back i want to install this and get my fuel pressure exact. Motor is 502 mpi N/A

Ive seen pull the vacum hose off factory regualtor after theres a manuel guage hooked up to the valve on the rail up front but what should my readings be before and after i install this regualtor.