I see the commercial for this thing all the time on SpeedChannel. Its called the G-Tech Pro Performance Meter. There is no hardwiring you need to do. The company says all information is taken from the cigarette lighter and sensors inside the unit. Measures HP, Torque, Speed, G forces, 1/4 mile time, RPM's, etc. etc.http://www.gtechpro.com/
I want to get it and try it, but not if its BS.