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G Tch Pro

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4 of 5
The G-Tech Pro is a really neat little computer that uses G-forces to measure acceleration, cornering, and a ton of other performance variables. Despite its easy installation (plug it into the cigarette lighter and stick it on the windshield) don't question its accuracy. Hot Rod magazine ran tests comparing the accuracy of a G-Tech to an actual 1/4-mile dragstrip's timing lights and found accuracy to within 0.01 second.