Cardinal points are the markings around the outside of a round analogue gauge dial which define the measurement increment divisions.
Featured pressure gauge products
760mmHg absolute range digital vacuum gauge - Digital vacuum gauge for measuring over the 0 to 760mmHg (millimetres of Mercury) absolute pressure range. 
DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor - All in one electronic switch, gauge and sensor designed specifically for use in the food, drink and biomedical industry for measuring process pressures.