IoT-based Alarm and Auto-switching system for manifold oxygen plant

Hello there..!
I am new here indeed i need your help.
I have a mini project to do where by i will deal on manifold oxygen plant found in hospitals. I my project i need to design the system which will Alert the operator through phone call when Oxygen pressure one side (right-hand cylinders) is below the threshold value and then perform Auto-switching of Cylinders from those of right hand side(with low level of oxygen) to those of left-hand side(full of oxygen).
Please can you recommend the required materials for completion of this project as well as their Specifications

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