i use an airtronics mt4 and have telemetry hooked up on all my nitros. i find the info to be quite valuable, far better than just a temp gun. if im out bashing or running laps i can just glance down and see the temps, it also has an over temp alarm so i know at an instant once im above my preset limits. i do also use the rpm on several of my cars, its quite valuable info as well, really helps with tuning shift points.