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This unit reproduces a dynomometer, logging and displaying horsepower and speed in real time. Plus, it could fit in the palm of your hand. Functions include bar graph power display, digital power display, peak/hold horsepower, and power vs. mph. Plus, there are timers for 1/8 mile, 1/4 mile, and 0-60 times, and the device can store the last six runs. Can also interface with the new SBC i-D boost controller, if your car has an ecu then wether it be turbo or n/a this unit can be used on it as its works off the speed sensor, so in total there are three wires, one for the speed sensor and the other is live and earth.