PLX is an electronics manufacturer form the USA who's most famous product is the PLX DM-6 display unit with the SM-AFR wideband controller. Other products include other sensor controllers and the Kiwi 3 OBD2 controller.
The PLX DM-6 & SM-AFR wideband air fuel kit includes an SM-AFR wideband controller combined with a slick PLX DM-6 touch-screen afr gauge. PLX is hassle-free and plug'n'play.