Disclosed example pressure transducers include: an absolute pressure sensor comprising a fluid input and a sensor housing configured to contain a reference pressure, and configured to output a signal representative of a pressure sensed at the fluid input; an outer insulation housing around the sensor housing of the absolute pressure sensor, wherein a volume between the outer insulation housing and the sensor housing comprises a vacuum pressure, wherein the outer insulation housing has a pinch tube configured to allow establishing of the vacuum pressure in the volume when the outer insulation housing is assembled to form the volume, and to seal the vacuum pressure in the volume when the pinch tube is sealed.