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Install this relocation hose into the test port below the fuel pressure regulator: 6.0L Fuel Pressure Adapter
Ford Truck Enthusiasts Forums - Rusty Axlerod's Album: Blue Spring - Picture
Pull out the air filter to get to the pressure regulator. I didn't pull the upper radiator hose, I just pushed it down out of the way. Use a socket on the filter cover so you don't crack it, and use a turkey baster to suck all the diesel out before you pull the test port plug.
If you don't use the hose, put in a 45* brass fitting (and all the male/female adapters) and angle the sending unit forward towards the fan. The test port is M12x1.5, the sending unit will be 1/8"NPT.
Install this relocation hose into the test port below the fuel pressure regulator: 6.0L Fuel Pressure Adapter
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It seems expensive, but you get a quality piece. I ran my sending unit to outside the brake booster and zip tied it there. I'll get some aluminum sheeting and make a custom bracket soon, but it's been working for 5-6 months fine now there.