2009 mustang gt frps codes with boost

I have a 2009 mustang gt 5.2L stroker with a turbo, the fuel system is a fore innovations setup with return regulator that varies the fuel pressure from 40 to 60 psi when the boost comes in. When I purchased the car, it had cels for the frps, there wasn't one on the rail. I bought the adapter and sensor and installed but the cels come back. I know it doesn't affect the performance because the 2 440 pumps are wired straight to the switch, but the engine light drives me crazy. Is there a way to put a resistor in place of the sensor to prevent the code or does this need to be tuned out? Any help would be appreciated.

No to the resistor it's not that kind of sensor it's doing multiple things. Pressure and temp signals. Did you hook the vac line to it. What are the readings, what cels.

So the fuel pressure jumps to 60 psi when you go into boost. What does it do when your manifold pressure is at zero? I believe our ecu is programed to look for a set psi over manifold pressure. So if it is at 60 psi whether your at 2# of boost or 12# the computer is looking for a 10 psi change in fuel pressure between the two manifold pressures and will throw a code for the frp not to be correct. So I think thast it needs to be tuned to look for the 60 psi or you need to regulate the rail pressure as a direct relationship with manifold pressure. I could be wrong but it is my basic understanding of how the frp is supposed to be maintained. Not sure how others with return systems regulate or tune their set ups.

I added the vacuum line and so far the cel has not returned after 2 days, only a few hours of driving. Yes, it jumps from 40 to 60 psi. My thought was it would still throw a code. I should be able to drive the car a few days next week. I have a few more bugs to work out before I go to the Dyno. I would make the assumption that it's looking for a 38psi difference if factory pressure is 38psi, but not sure. This car will run 20pounds of boost on 110 octane. I figure this is why this pressure increases 20# for the boost. I only have this at 12# currently, there is an adjustment in the glovebox. When I get the fuel low enough, I will use the 110 and turn the knob.