With modern engines becoming more complex with each new generation and model, keeping your OBD-II car in check and in tune can be difficult. A proper air/fuel ratio is a key element to maintaining balance and optimal performance, and using a wideband and various gauges to monitor important engine variables is a good place to start. Unlike the narrowband O2 sensors used by most OEMs, a wideband provides a more detailed and broader view of what's going on in your air/fuel delivery department. By providing more data to work with, a wideband is an invaluable way to aid in the tuning process to extract the most power possible (and keep your motor as safe as possible). Having the proper gauges mounted in your car's cabin is a great way to keep yourself informed on the fly, so don't leave anything up to guesswork.