I've read the thread, so I will change the pressure sensor. Back there car owners knew the difference. But I don't know, I got the car with this way. I used to have fiat bravo, fuel gauge had an offset like that. Did't bothered me, but this is a sensor for engine running. If it's reading different than actual value, the engine(ecu) makes different calculations, right? So next thing morning I will buy a new sensor.
Also you're right that I know a 3rd person that makes remap, and tuner -close friend of mine- who will flash the rom file. When we checked the rom, for first time. It was like an amator job to cancel the DPF & EGR. so we got a good one I think this time. Last month I've got an ELM327 bluetooth adaptor, but It ...k the car. locked it. I had to remove the battery, to run the car again. I broked it so I would never use it. I will buy a good one asap. so I tried to read as you said but ,could not read and had a headache for a day, to restart the car.
Thank you, I will inform you asap after I change the sensor.