Fear not, fuel injection fans FAST has just made it easier than ever to convert your engine from a carburetor to fuel injection, using these FAST ez-efi self-tuning engine management systems. The most important feature is the self-tuning operation that does not require chasing components, expert tuning experience, or a laptop computer to tune. Simply hook them up, answer the basic Wizard setup questions on the included hand-held display, and the systems truly tune themselves. They include a wide-band oxygen Sensor and wiring harness.