g tech performance meter

[mike w]

guys i have used 1 of these and they are nice no need to go to the track this thing is very close many drag racers use it for testing before going to the track. i am bidding on 1 now on ebay slightly used go to summit and look this gadget up NICE.

 

[A Snake]

I have one and yes they are fairly accurate if you folllow all of the instructions to calibrate to each vehicle.
It is not as simple as changing from one vehicle to another
A toy that can be used for tuning also if you are making major component changes.