I've borrowed a G-Tech from a friend of mine for 7.3. I only did 0-60 runs, as I didn't really feel like going a full 1/4 without knowing my EGT. With my exhaust hacked off at the time (prior to my magnaflow kit) stock intake, and SuperChip I was running right around 9 second 0-60's. That sounds pretty accurate to me, considering I ran a few stock 6.0 strokers and I pulled very slightly on them. So i'd say it's a pretty accurate device, however i'll only trust my local drag strip to tell me the exact 1/4 time.
By the way, my friend is selling that G-Tech for 100 bucks. He has some other thing he bought that tells all his times and stuff. It's in perfect shape, so if any of you are interested email me at
Goodfella8243@yahoo.com and let me know! Thanks!