MANOMETRO MANOMETRO SPORT

I have a problem with a Mitsubishi Montero Sport year 2004, engine 2.5
The problem lies on the board, where a turbo pressure manometro is located. But the gangster does not record the existing pressure; The only thing that does is that when the needle is given contact, it goes up to the maximum and when the engine is thrown back to zero and from there it does not register anything.