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Originally Posted by POLARBEAR666
I like being able to see the fuel pressure on the gauge attached to my Sard. Which is something I could not do on the stock one. That alone is worth the small price of $200.
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the fuel pressure you are seeing is not the true fuel pressure, you also are unable to monitor this guage from within the car (somewhat pointless)
anyhow, what you really want to monitor is differential fuel pressure.
this fuel pressure value is the value of positive rail pressure against manifold pressure minus the return rail pressure.
the purpose of this is to see when you reach the ceiling of the fuel pump and to determine if your fuel pressure maintains its static pressure against manifold pressure. ie the rising rate. 43.5psi (299kpa) + 1bar positive mainfold pressure (14psi+), resulting in a true rail pressure reading of 57.5psi. (your guage will not display this value)
again, its an understanding of the equipment, not what looks fancy in a show car/magazine.