Sounds like it's in the wrong place and you are reading actuator cracking pressure rather then real pressure.
If the gauge is conneted to the hoses surrounding the turbo, that will be the case.
This type of connection was fine on older cars i.e early turbo's that ran actuator pressure i.e Cossie's etc... but the more modern cars run an electronic control bleed-off style boost control and lower actuator cracking pressure.
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