how accurate is the Aeromotive Fuel Pressure Regulator pressure gauge?

[toadster]

looking at a recent data log, I noticed the PSI at the ECU measurement is about 57 PSI (not enough) - although the aeromotive gauge is showing 65-67PSI

which should I believe? what has everyone's experience been with the Gen3 Coyote?

Screenshot 2023-05-24 113421.png

edit:

in the Ford instructions - mentions 65PSI, but 55psi at the fuel rail, engine off (assuming this is the ECU pressure reading?)

Screenshot 2023-05-24 131636.png
so it seems I may still be short on PSI according to the ECU