Just got and tested the new G-Tech Pro Competition with the latest 2.0 firmware. The unit is easy to use, was a cinch to calibrate, and seems to work flawlessly. Tesla Electronics alleges 0.005 seconds accuracy.
I screwed the permanent included mount into the ashtray using three of the four included screws. The 12 vold power cord can be stuffed into the ashtray itself and the installation looks like it might have been done by a pro.
Operation is a snap. In the run mode the unit displays a surprisingly accurate tach (you really don't need this; that's what that big black and white guage next to the speedometer is for).
To do a 0-60 and or 1/4 mile run all you do is make sure your Rex is stopped-push the OK button (the unit will wait patiently for you to get underway) and will begin recording and saving the data for later review.
What I like most is that all you do is push the button, ignore the unit, and concentrate on your driving. Incidently, I tried two different suction cup installations on the dash and decided against them.
I've done three 0-60 runs (no safe place to run the quarter here on the Cape). First run I stopped at a Rt 28 on ramp, did a moderate clutch smoking launch and logged a 5.781 second launch going uphill! Second, was a not so well executed 3,000 RPM in the flat run that netted a 5.92. And the best of the three (so far) a 5.622 4,000 RPM fairly hard drag launch.
The only two things I don't like are the polarized display screeen (the display is no longer legible with polarized sunglasses), and the fact that this little devil could wind up being VERY hard on your clutch.
$249 + $10 UPS shipping direct from Tesla 310-452-0030.
I'll give G-Tech Pro Comp ver 2.0 a 9 out of 10.
If you do the ash tray mount; it I'll be a snap to swap your G-Tech into your buddies Rex!