9psi (0.62 bar) sounds like it's in limp mode or the boost controller is knackered. Therefore the figure recorded sounds bang on.
It should be 17.5psi (1.2bar), so your gauge, taking into accounting for reading error (most gauges over read a touch) sounds about right.
Perhaps the dyno pulled the wrong pipe off to connect their gauge, preventing your boost control solenoid working.
Go see Charlie.........
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