ok i see what your saying. you have to have it out in the air, hold calibrate for 3 secs for it to calibrate then put it back in.
i haven't attemped the calibration yet, but right now it holds steady at 12.5 at idle. how far from the turbo did you put your sensor? i know that most people say different things. i put mine about 4-5 inches from the turbo. from what i have read if its to close the only thing that could happen is you will burn the sensor up.