Overview: We're proud to introduce our next generation wideband oxygen sensor controller with intelligent health monitoring technology and current for improved sensor performance. Our new Gen4 Wideband AFR Gauge Combo utilizes the next generation in Bosch Wideband Air/Fuel Ratio sensor technology. The Gen4 is faster, more accurate, more durable, and uses less power than the Gen3. The Gen4 also employs the innovative PLX Devices new intelligent health monitoring technology where the oxygen sensor is meticulously monitored every 2mS (488 times per second) to obtain peak performance, accuracy and reaction time. Coupled with the updated patented DM-6 touch screen MultiGauge, battery voltage is displayed from 9V-20V, sensor life is displayed from 0-100%. The oxygen sensor reaction time is displayed from 10mS/1000mS on the brilliant high contrast OLED display.

The PLX Wideband AFR (UEGO) gauge combo combines an accurate, fast response wideband AFR (Air Fuel Ratio) controller with the world's most advanced touch screen 2 1/16" gauge (52mm). It includes a Bosch LSU4.9 wideband oxygen sensor. The wideband controller (SM-AFR) works with gasoline, bio diesel, ethanol, methanol, E85, LPG, and CNG. It includes two analog outputs (wideband 0-5V, and narrowband 0-1V) for interfacing with 3rd party devices and one digital serial output for interfacing with the DM-6 gauge and other Multi Gauges. The wideband analog output is ideal for interfacing with aftermarket ECU's and data loggers. The narrowband output is ideal for stock narrowband oxygen sensor replacement where the simulated narrowband analog output is fed back into your ECU to make it operate as if the stock narrowband oxygen sensor is still installed while running the PLX wideband setup. All three outputs can be used simultaneously. Additional features include advanced soft start technology which prolongs the oxygen sensor's life and an aluminum enclosure for durability and reliability.

Gen 3 vs. Gen 4
  • More accurate
  • Uses only 7.5Watts compared to 10Watts
  • Faster response time
  • Improved sensor durability
  • Faster warm up time
  • Maintains accuracy throughout life
  • Less susceptible to contamination to surrounding pollution
  • 10+ years of average service life
DM-6 Gauge:



1) Left Capacitive Button
2) 16 Green/Orange/Red LEDs
3) 1.1" OLED Screen (124 x 36 pixels)
4) Right Capacitive Button
5) PLX Capacitive Button

Physical Dimensions: Standard 2 1/16 x 0.7" (52 X 18 mm)
Display Technology: 1.10" OLED Screen (124 x 36 pixels) LED (16 Green, Yellow, Red)
Viewing Angle: 180 Degrees
Polarization: None
Supply Voltage: 3.3V and 8V from Sensor Module
Power Consumption: < 1 Watt
Cable Length: 6' Power, 6" Serial
Operating Temp: 0 - 85 Degrees Celsius
Human Interface: 3 Button Capacitive Touch
Number of Sensors: 16 Maximum Daisy Chain
Supported Units: US Standard, Metric


SM-AFR Wideband O2 Controller:



1) 12V power input
2) 4 prong analog clip
3) Termination jumper
4) Serial RX Plug (In)
5) Serial TX Plug (Out)
6) Sensor Input Clip

Physical Dimensions: 2 x 2.875 x 1.125" (52 x 75 x 28mm) L x W x H
Technology: PLX Critical Response Technology, Fast Response PID
Accuracy: < 0.1AFR (Gasoline) Wideband, < 0.2AFR (Gasoline) Narrowband
Measurement Range: 10-20 AFR (Gasoline), 0.68 - 1.36 lambda (Gasoline), 0 - 100 O2 Sensor Health, 0 - 1000 mS Reaction Time, 9 - 20 Volts
Analog Outputs: Wideband Linear 0-5V, Narrowband 0-1V (Driving Current 20mA)
Operating Voltage: 9V-20V
Power Consumption: 20 Watts (Max), 13 Watts (Typical)
Power Supply Technology: High Efficiency Switching with Soft Start Technology
Operating Temperature: 0 - 85 Deg Celsius
Sensor: One Bosch LSU 4.9
Enclosure: Automotive Grade Plastic