Abstract: A distributed pressure monitoring system is disclosed for monitoring formation pressure along substantial lengths of a casing in a borehole. The monitoring system has a communications line connected to surface facilities on one end which leads down the casing on the other end. A plurality of pressure sensors are spaced along the casing, each connected in communication with the communications line. A sensor housing encloses each sensor and an open pressure tentacle is attached to the sensor housing in communication with the pressure sensor. Another aspect of the present invention is a method for simultaneously monitoring the formation pressure in multiple zones of a borehole. The formation pressure is substantially separated from overburden pressure and pressure sensors adjacent selected zones of the formation are substantially isolated by filling the borehole with a cement selected to provide less hydraulic diffusivity than that of the formation.