actually it would be pretty simple .. u would need the following depending on how sophisticated u wanna be and how much time u wanna waste ... u need an electrical boost detector, pressure sensor .. i'm not sure how they work but i would assume they convert pressure sensed into a voltage, then its simple ... just do some tests to calibrate a particular voltage to pressure and then use a micro controller which u could also use as a boost controller ... buy an LCD screen ... one of them character types, people who know what i'm talkin about would be one of them hitachi types and they are hell easy to use, they are found on things like micro tech displays and i think even the powerfc hand controller .. but yeah they are easy to program ... do some tests ... the program would be pretty simple ... but yeah if u have lots of time to waste it wouldn't be that hard .. especially if you're an electrical/computer engineer like me