Making EGT reader

I'm new to this. I am using a thermister out of a piece of ag equipment and i cant get it to read any where near correct. It has a resistance of 223ohms at room temp of 26C and 245ohms at temp of 55C. i keep getting a nanc on my display or goes to -273.15 and that is cause i used some code from the site. can anyone help me?

We need to see a schematic of how the thermistor is wired to the Arduino and the code that you are using. Which Arduino are you using?

Please read the "how to use this forum-please read" stickies to see how to post code and some hints on what we need to know in order to give the best help. See #7 & 11.