It is a tool like any other tool, the end user determines how effective it becomes Mine has help me immensily Buy a dual wideban with the ability to read RPM and store data so you can transfer it to a laptop or some other devise to read and analyse it later instead of having to focus on the gauge while driving, racing or in traffic
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Mine has help me immensily 
Buy a dual wideban with the ability to read RPM and store data so you can transfer it to a laptop or some other devise to read and analyse it later instead of having to focus on the gauge while driving, racing or in traffic 
