The basic kit comes with depending on application...Pyro, Trans Temp, Boost, and depending on 7.3 or 6oh, Coolant temp for the 6er and oil temp for the 7.3.
There are also other probes you can buy, and monitor up to seven things at once, you can only see four at once, but you can monitor 7.
You can also hook it up to the lap top and do data logging, it will give you Max values on whatever it is you are monitoring.
So if you do a 1/4 mile run, and want to see what your max boost or whatever was, just goback into it and pull it up, pretty cool I think. I love mine.