--- product_id: 3496918 title: "AEM 30-4900 Wideband Failsafe Gauge" brand: "aem" price: "€ 3.51" currency: EUR in_stock: false reviews_count: 11 url: https://www.desertcart.hr/products/3496918-aem-30-4900-wideband-failsafe-gauge store_origin: HR region: Croatia --- # Data logging Dual display Customizable design AEM 30-4900 Wideband Failsafe Gauge **Brand:** aem **Price:** € 3.51 **Availability:** ❌ Out of Stock ## Summary > πŸš€ Elevate Your Performance Monitoring! ## Quick Answers - **What is this?** AEM 30-4900 Wideband Failsafe Gauge by aem - **How much does it cost?** € 3.51 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/3496918-aem-30-4900-wideband-failsafe-gauge) ## Best For - aem enthusiasts ## Why This Product - Trusted aem brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Vibrant OLED Display:** Experience crystal-clear visuals with a full-color OLED display. - β€’ **Advanced Data Logging:** Capture over 3 hours of data at 20Hz for in-depth analysis. - β€’ **No Calibration Hassle:** Enjoy a plug-and-play experience with zero free air calibration. - β€’ **Simultaneous Readings:** Monitor boost/vacuum and AFR/Lambda at a glance. - β€’ **Customizable Aesthetics:** Switch up your style with interchangeable faceplates and bezels. ## Overview The AEM 30-4900 Wideband Failsafe Gauge is a cutting-edge automotive tool that allows users to simultaneously monitor boost/vacuum and AFR/Lambda without the need for free air calibration. Featuring a Bosch Wideband UEGO sensor, vibrant OLED display, and over three hours of onboard data logging, this gauge is designed for precision and ease of use. With customizable faceplates and advanced data analysis capabilities, it’s the perfect companion for any performance enthusiast. ## Description The Wideband Failsafe Gauge provides the ability to accurately tune AFR, while actively protecting your engine by constantly monitoring AFR curves and activating a user-defined Failsafe strategy if it runs lean. The Wideband Failsafe Gauge is a Universal Exhaust Gas Oxygen (UEGOβ€”β€œyou-way-go”) controller with an internal boost sensor, an internal data logger and a full color Organic Light Emitting Diode (OLED) display. It includes technology to activate a Failsafe strategy in the event AFR falls outside of a user-defined operating window. If the AFR falls outside of the set operating window, the Wideband Failsafe Gauge triggers a user defined output function that can save an engine from catastrophic damage. This product is a must have for all tuned performance engines, either forced induction or naturally aspirated, fuel injected or carbureted. Any high performance vehicle owners who want a highly accurate AFR tuning tool with logging and a protection strategy that can save an engine from catastrophic failure will want this Failsafe device. After the engine is tuned and a safe operating window of AFR is established, the Wideband Failsafe Gauge continually monitors AFR and boost or vacuum to make sure that AFR does not fall out of the defined operating window at a given boost or vacuum level. If the Wideband Failsafe detects an out of range AFR reading, the gauge triggers a low side output (ground signal with a 1.5 amp draw max) that can save your engine from catastrophic damage. Use the gauge’s intuitive software to configure the low side output, create a user-adjustable time delay strategy to prevent false alarms, and customize the gauge lighting to flash and alert the driver if an alarm is triggered. ## Features - 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 includedOn-Board 3+ hour Data logging capability at 20hz per parameterFull 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 - The system contains an on-board data logger for logging over three hours of data recording (20 Hz per parameter) of AFR, RPM, boost, alarm, and others. Data logs can be downloaded for viewing in the new AEMdata software - AEMnet compatible ## Technical Specifications | Specification | Value | |---------------|-------| | Item Weight | 400 Grams | | Item Dimensions | 2.17 x 2.76 x 2.17 inches | ## Product Details - **Brand:** AEM - **Item dimensions L x W x H:** 2.17 x 2.76 x 2.17 inches - **Item Weight:** 400 Grams - **UPC:** 840879022150 - **Global Trade Identification Number:** 00840879022150 ## Images ![AEM 30-4900 Wideband Failsafe Gauge - Image 1](https://m.media-amazon.com/images/I/61Kw-7JhmSL.jpg) ![AEM 30-4900 Wideband Failsafe Gauge - Image 2](https://m.media-amazon.com/images/I/81pC+KbdIoL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Nice guage and good data to have for your car *by T***O on Reviewed in the United States on July 1, 2018* Works very well - it took some time to get installed but probably more my issue than the gauge. Learning more about the settings and data but good info to have for my built turbo car. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Excellent investment for monitoring your build *by R***A on Reviewed in the United States on February 19, 2013* 2011 Turbo Hayabusa Est 400whp on E85Bought this for a combo boost/wideband. I will tell you this: THE ANALOG OUTPUT CAN BE TRICKY TO PROPERLY CALIBRATE IN YOUR TUNING SOFTWARE. The sensor is linear but ONLY between .5 and 4.5v NOT 0-5v. if your tuning software or datalogger can accept a fully custom calibration table you will have no issues. other software that assumes 0-5v linear may have some issues unless tweaked. When in doubt the gauge is right 99.9% of the time so rely on those logs if you have to.The built in software is simple to use and easily allows setting limits for the included alarm triggered ground output which can be used to kill boost, ignition, trigger relays, activate lights, or anything else with a maximum 1.5a draw.Overall very impressed. Amazon also had the best price after shipping. If the warehouse is in your state they DO collect tax now so be prepared for that. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Only wideband I buy anymore *by R***D on Reviewed in the United States on February 9, 2017* This is the only wideband I buy anymore. Works too well as a safety device, datalogger, and clean gauge, that its pointless to buy any of the others.Save your money and your investment, and pickup this dual gauge, wire in a proper safety signal, and go enjoy your car/bike. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/3496918-aem-30-4900-wideband-failsafe-gauge](https://www.desertcart.hr/products/3496918-aem-30-4900-wideband-failsafe-gauge) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-24*