Zeitronix ZT-3 Wideband Oxygen Sensor Kit LSU 4.9 AFR & ZR-3 Black Gauge Red LED

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Zeitronix ZT-3 with Sensor and ZR-3 Air/Fuel Gauge Combo

Zeitronix ZT-3 with Sensor and ZR-3 Air/Fuel Gauge Combo

Included in this ZT-3 / ZR-3 Kit:

  • Zt-3 Wideband Air Fuel Ratio Meter and Datalogging System
  • ZR-3 Air/Fuel Gauge: Black Bezel / Red Digits
  • Bosch 5 wire Wideband Oxygen Sensor, Lambda LSU 4.9 series
  • Oxygen Sensor Harness (10 feet length)
  • Signal Harness
  • Serial datalogging cable with RJ-12 to DB-9 converting plugdoes not include serial to USB adapter
  • Instructions

Made in the USA!  The Zeitronix Wideband Air/Fuel ratio meter and datalogging system is a high quality, stand-alone system for use with carbureted and electronic fuel injection engines. The new Zt-3 has the same high quality, high precision air fuel ratio readings as the Zeitronix 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 in the case for easy zip tie mounting in a tucked away location.
Works with a stand alone engine management system, a piggy back fuel control or a carbureted engine. Finally you can tune for more power, closer to the edge, precisely monitoring Air/Fuel ratio and datalogging up to 9 hours of data with a blazing rate of 70 samples per seconds per graph.

Very simple installation - connect two wires to +12V and ground and place the O2 sensor in the exhaust stream and you are ready to read AFR! A simple LED indicator displays off, warm-up and running modes.

IMPORTANT: Warranty does not cover oxygen sensor, as these are wear items.  Each oxygen sensor is tested to be fully functional by Zeitronix before shipping.

Zt-3 Specs:

  • 0.1 AFR accuracy
  • Operating voltage 10V to 18V
  • Switching power supply for oxygen sensor heater
  • Precise sensor temperature control
  • Reverse polarity protection
  • Integrated self resettable fuse
  • Positive lock connectors
  • Protected inputs and outputs
  • Flexible Plug and Play Sensor Harness with a small, easy to route through the fire wall, connector
  • Adjustable Narrowband Switching Point
  • Configurable Wideband Analog Output


  • Bosch Wideband O2 sensor Input
  • Simulated and adjustable Narrowband Output to feed a stock ECU
  • Linear Wideband Output (configurable with a default setup of AFR = Volts * 2 + 9.6)
  • Serial data output for real time datalogging (PC laptop required)

ZDL Datalogging Software: The Zt-3 communicates with the PC Laptop via the serial port. The ZDL logging software records up to 9 hours of data per single file. Different screen options are available. It has a black background for easy night tuning. The logging start, stop and pause accessible from keyboard shortcuts. Excel and text data export. Win98/NT/2000/ME/XP/Vista/Windows 7 compatible. You do not need P4, P3 or even P2 laptop. Zeitronix understands that you want to leave your new laptop at home and dedicate your old laptop to car tuning. If your laptop is capable of running Win95 and up it is good enough for the Zeitronix logging software.

ZR-3 Air / Fuel Gauge Specs:

  • Blue digital AFR readout with large 0.4" (10mm) digits
  • Slim 0.75" (19mm) design for flexible 52mm pod or surface mounting options

The ZR-3 Gauge plugs into the Zt-3/Zt-2 DATA port. Power and serial data is supplied directly through the single connection - there are no additional +12V or ground wires. The ZR-3 cable length is 5 ft.

The ZR-3 AFR gauge is only 6/8" (19mm) thick. The back of the gauge is completely flat with cable hidden in a cavity and can be surface mounted almost anywhere inside the car cabin using a piece of Velcro or double sided tape. The ZR-2 base allows the gauge to be mounted in a standard 2” 1/16 (52mm) gauge pod. For additional mounting options the package includes 2 set screws and 2 nuts (4-40 screw size) ZR-3 Gauge Dimensions: Base diameter 2" 1/16 (52mm) Bezel diameter 2" 1/2 (62mm) Thickness 0.75" (19mm) Digit height 0.3" (7.5mm)

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