Bourdon tube pressure gauges are fitted with a magnet on the Bourdon tube itself so that as pressure increases, the magnet moves along a circumference. A circular PCB with many reed switches mounted from center to circumference giving a potentiometric two wire feedback can be used to accurately measure pressure. The advantage with such gauges is that multiple alarm points can be set. Suitable products: SMD formed MM-1018 and RM-1318 reed switches, and R3 SMD reed sensors.
