Many of the performance numbers you read in all the popular auto magazines and on automotive television shows are gathered and measured by accelerometers similar to the G-Tech pro. Calculating HP, speed, distance, Mass, and time to get performance numbers is actually a very easy equation. The G-Tech can calculate acceleration with it's internal accelerometer and time it calculates by it's internal clock which is automatically triggered at the launch of your stang. Mass is the weight of your stang in pounds. Now that you have entered the weight of your stang into the G-tech pro, it has all the info it needs to further calculate rear wheel horsepower.
Assembly is easy with the Velcro strip and plastic anti vibration legs and suction cup mount.
This is because your stang is actually moving down the road and not standing still on a dyno. Remember that as your speed doubles, wind drag quadruples in resistance. Also because of this your HP may show slightly less than on an actual standing still dyno. This would mean that if you improved the aerodynamics of your stang that it would actually show up as extra HP on the meter even though you did not do anything to your engine. In many forms of road racing HP is talked about and gained in this manner.