Whether you have a normally aspirated or forced induction engine, any serious engine modifications will require the use of an Air/Fuel ratio gauge to warn you if the mixture is too lean or too rich.

Auto Meter's 2"electrical A/F ratio gauge uses 20 small LEDs arranged in a sweeping pattern to indicate "lean,""stoichiometric,"and "rich."  Although the Auto Meter gauge is not as accurate as a wide band Lambda sensor,...