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That is a regulated return setup (aftermarket fuel system), what it does is cure the dead head fuel rail issue with these motors 7.3. The gauge your referring to is the pressure gauge for the fuel pressure regulator ( the red and black thing behind it) most people set it to around 65-70 psi. Also notice that the original ford fuel bowl is no longer present which would also require a prepump and post pump filter setup.
The gauge to the far left in your picture is a boost regulator, which is blocking the MAP sensor from seeing the boost the turbo is actually making for the ford computer will start to defuel the truck with anything over 22psi boost pressure and set a code.
Yes there is a benefit, and I'm sure members who know a little more will chime in.
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02 F-350 Reg Cab Auto Trans L2 Blue, Marinco Mod, ZooDad Mod, Bilstien HD Shocks, Ford Alarm Code 3 Remote Start, Energy Suspension Spring Bushings and SwayBar Bushings, 2500 Watt Inverter, Sirius Sat. Radio, (Hardwired), Garmin Nuvi 250 (Hardwired), Blue Sea 6 Circuit Fuse Panel X2, Western 8' Pro Plus Ultra Mount Plow, 08 Taillights, Stancor Mod, Ford AIC, AIH Delete, Stainless HPX, Foil Delete, 05 PTM Tow Mirrors, 05 Upfitter Switch, 05 Center Dash, Federal Signal Smart Siren with Signal Master...
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