Does this really work very well ? www.gtechpro.com

It helps about 5 to 10 percent arrurcate.

 

it's not very accurate, but it is consistent so it could be used for testing mods and seeing how much different your times are, but dont count on it for hp, 0-60, 1/4mile


there's a big thread on it in the general (or maybe 4th gen) forum