PCI is a British manufacturer of high quality process instrumentation and diaphragm seals. View Full Gauge CataloguePressure Gauge Introduction An information source for helping you select the correct gauge for your situation. Full Range of Pressure Gauges View the complete range of PCi pressure gauges (2.63 Mb) Standard Pressure Gauges A comprehensive selection of standard range pressure gauges. Capsule Gauges A range of capsule gauges for low pressure situations. Differential Pressure Gauges Four ranges of gauges. Miscellaneous Gauges Includes test gauges, heavy duty, digital and transmitter gauges.