Wideband Failsafe Gauge, with boost sensing

$316.35 $299.70

Accurate AFR data is critical when tuning an engine. Running rich (very low air/fuel ratio, excessive fuel) can cause a loss in power and fuel economy, while running too lean (very high air/fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air/fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency.

This is an AFR wideband, boost gauge, warning system, failsafe trigger and datalogger, all in one!!!

The Wideband FAILSAFE Gauge is an ideal engine tuning tool. The highly accurate Bosch AFR wideband sensor is maintenance free and never requires free-air calibration, enabling you to fine tune AFR from an AEM programmable engine management system, any other programmable EMS or piggyback programmer. For carbureted applications, it can tell you when its time to swap carb(s), change jets or simply modify fuel pressure. Ideal for Porsche CIS equipped engines, as an ideal diagnostic tool.

Kit comes with 6 different faceplates and black and silver bezels.

  • Black and White AFR in sweeping LEDs
  • Black and White Vacuum/Boost in sweeping LEDs
  • Black Vacuum only in sweeping LEDs
  • Black Lambda in sweeping LEDs


  • Displays both boost or vacuum and AFR or Lambda simultaneously on the same gauge
  • No free air calibration required ever
  • Internal boost sensor
  • Bosch Wideband UEGO sensor and weld-in bung included
  • On-Board 3+ hour Datalogging capability at 20hz per parameter
  • Full color Organic Light Emitting Diode (OLED) Display in center, user selectable feature (boost/vacuum or AFR)
  • 24 three-color sweeping LEDs, user selectable feature (boost/vacuum or AFR)
  • Intuitive set up software
  • Interchangeable faceplates and bezels (see options, above)
  • Data analysis using AEMdata software

Free shipping within the continental USA. Overseas will incur a slight shipping surcharge. Laptop not included.

  • Model: 30-4900
  • Shipping Weight: 2lbs
  • 199 Units in Stock
  • Manufactured by: AEM
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