Project Help

[JingKa]

Hello Everyone!!

Well first off I am very new to all this but learn quickly, I have a decent programming background, but my real questions is the following.

I need a device that can monitor and regulate the flow of a gas like Co2? do these exist?
also a way to measure the level of fluid in a sealed container, would the sensor have to be in the container is there a way to measure from the out side??

also I would like to be able to have these stats displayed on a 7" TFT LCD screen, so far I have seen super small ITX boards that have onboard video, because the control unit will be running linux, and that device will read the stats of the TEMP and control the Regulator. it will also have other features(computer related)

so what would be the best way to approach this? is there anyway to run linux from a Chip and if so how can this be displayed on a color LCD monitor?

any help, pointers or web sites to check out would be GREATLY ever so GREATLY appricated :)

I apologize if this is posted in the wrong section.

Thank you everyone!!