Decided to start a project based discussion regarding the BP I posted http://forum.43oh.com/topic/4301-absolute-pressure-cooker/ so as to not clutter that up.
For those that haven't visited that, here's a re-cap:
MCU samples an MPX4250A absolute pressure sensor, takes the reading and looks up a value from a table, and sends that to a DAC for output. It's actually two DACs though so there are possibly two values to read and send. There's an SPI eeprom for storing the values and the DAC's are set over SPI as well.
There will be software that interfaces to it, at least for the stand-alone version, that allows for altering the tables therefore making the unit able to read absolute pressure and output arbitrary voltages based on the readings.
There will be two tables, more appropriately I guess I should call them arrays, with 256 entries. Not considering the accuracy of the MPX sensor, ADC or the DAC, considering 5 volts, that's a resolution of approximately 0.02 volts per cell / entry. Good enough, I think, for my purposes.
Eagle board / schematics can be found at the link above.