If the pointer of the pressure gauge does not return to zero, this may be due to a mechanical failure of the pressure gauge caused by shock or overpressure. In this case, replace the defective pressure gauge with a new one.
If the pointer of the pressure gauge does not return to zero, this may be due to a mechanical failure of the pressure gauge caused by shock or overpressure. In this case, replace the defective pressure gauge with a new one.