With the New Passport G-Timers from Escort, Monitoring your vehicles performance has never been easier. Now you can accurately measure horsepower, 0-60 times, 1/4 times runs, acceleration, cornering, & braking G-forces, including friction circle. For drag race, autocross, track event or road race enthusiasts, the G-Timers can measure your vehicle's performance as you change components, set-up, or driving styles. There is no connection with your car's speedometer. No installation is required.