T at the carb inlet & run it to the reg to one of the "in" ports & cap one of the (2) "out" ports with a NPT plug and run the other "out" port back to the 1/4" nipple on the sending unit. Use a "red" holley low psi reg. If running a holley dual inlet chrome line T at the upstream hose barb end that's where to T and where to add a port to check fuel psi