I love my Scangauge II. Good stuff. Unfortunately, I tried the trans temp sensor code for the XGauge for my 04 TJ and it didn't work. They do work for some Dodge models, but none of those codes work on the TJ either...been there, tried it. I also coded the O2 sensor readings in, which ended up being mostly useless since you can't see a graph of what's going on over time. The TJ's ECU didn't support the XGauge A/F ratio codes either. 05-06 TJ ECU's may be different, but 97-04 ECU's are just too "dumb" for the fancy features.