What about simplifying your system:
Since you want only to monitor a pressure transducer why not use a simple process indicator. It seem to me that you do not need a full PC for that purpose. A PC is excellent at making calculations, graphics, datalogging, etc. do you really need those...
What about using Nitinol wiring (memory shape metal). It is a metal available as different diameter. By passing an electric current thru it it takes back a previously applicated shape. It is available on the market throug science store, online boutiques, home robotic suppliers and others...
