He has also put up a subsequent tutorial on displaying the temperatures using a linechart
He uses a Dallas DS18B20 digital thermometer, but says you can easily replace that with data from any sensor you like.
I recommend you follow his tutorials using a Dallas DS18B20.
Once you are comfortable with how things work, you can try modifying the set-up to your sensor of choice.
The links to his original posts are here :- Gauges and Lines