Interface a 5v pressure sensor with a 3.3v ADC
Since your pressure sensor only uses about 6mA according to the datasheet you might be better off with a switched capacitor step up supply like this one:  http://www.ti.com/lit/ds/symlink/lm2750.pdf

To get your analog signal down to levels you can read you could just do a simple voltage divider.  Or you could use an opamp this paper probably gives you more information than you'd care to know but there's a good circuit at the bottom of it:  http://www.ti.com/lit/an/slyt173/slyt173.pdf

Hope that helps.