Hey, I've heard really good things about the venom-racing temp probe. It records the min and max temps during a running session while also displaying the current temp. If you place it in the right place you should be fine. If you like the convenience of an on-board temp guage what you should do is bring it into the hobby shop and get the guy there to use his gun to take a temp and compare it to ur reading. Thats what I did and my venom is reading just fine. I'm going to take a video of mine running and stuff later. I will make a topic for ppl to post all their videos of it running. That way people can see how everyones t-maxx performs. 
Venom guage:
http://cgi.ebay.ca/New-Venom-Racing...ryZ44028QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Venom guage:
http://cgi.ebay.ca/New-Venom-Racing...ryZ44028QQssPageNameZWDVWQQrdZ1QQcmdZViewItem