Zeitronix Zt3 Zt-3 Wideband Kits The new Zt-3 has the same high quality, high precision air fuel ratio readings as our signature Zt-2 wideband. The Zt-3 supports wideband air fuel ratio and lambda readings, adjustable simulated narrowband output and a new configurable linear wideband output for ease of use with engine management systems and 3rd party gauges. The new Zt-3's dimensions are only 3 by 2 by 1 inches. The case includes slots case for easy zip tie mounting in a tucked away location. Precise wideband air/fuel ratio (lambda) measurements Standalone system supporting fuel-injected and carbureted engines