---
product_id: 64475331
title: "AEM 30-4911 Flex Fuel Fail Safe Gauge"
brand: "aem"
price: "£503.82"
currency: GBP
in_stock: true
reviews_count: 2
url: https://www.desertcart.co.uk/products/64475331-aem-30-4911-flex-fuel-fail-safe-gauge
store_origin: GB
region: United Kingdom
---

# AEM 30-4911 Flex Fuel Fail Safe Gauge

**Brand:** aem
**Price:** £503.82
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** AEM 30-4911 Flex Fuel Fail Safe Gauge by aem
- **How much does it cost?** £503.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/64475331-aem-30-4911-flex-fuel-fail-safe-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

## Description

The flex fuel Wideband failsafe gauge displays air/fuel ratio, boost/vacuum and ethanol content, and can actively protect your engine from damage if it runs lean or excessively rich. If you need an ethanol content Sensor with your flex fuel Wideband failsafe gauge, please click on PN 30-4911.

## Features

- Make sure this fits by entering your model number.
- On-board data Logger
- Vibrant organic LED display
- Example engine protection strategies
- Fit Type: Vehicle Specific

## Images

![AEM 30-4911 Flex Fuel Fail Safe Gauge - Image 1](https://m.media-amazon.com/images/I/61srXBmBDnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    Nice upgrade from the previous model but could use some company fine tuning!
  

*by M***. on Reviewed in the United States 🇺🇸 on December 5, 2016*

I just upgraded from the previous fail safe model that did not include the ethanol content display. This feature is fantastic for keeping check on the the quality of pump fuel. A few disappointments with the kit are that the wires to the flex fuel sensor are way way too short. You must cut and soldier in wires to extend the cable length. The other disappointment is there is no way to calibrate the gauge. I test tube check the fuel at the pump and will find that the ethanol content is consistently E-85 however the gauge reads E-79, E-80. I figured I might have got a bad sensor so I purchased another with the same results. The continental sensors do have a 5% error range and this is right there. It may also be that extending the wires which you will need to do, cause a slight voltage drop thus causing the inaccuracy. Either way I hope AEM comes up with a fix. Overall great gauge. Boost is accurate until you hit the 25 psi range. After that it's accuracy drops quick. During several dyno sessions it would say my little whipple 2.3 was putting out 28.5 lbs of boost. The shop gauge was recording a cool 25. Overall great product just needs some more software development time.

### ⭐ 







  
  
    Junk- DO NOT BUY
  

*by R***. on Reviewed in the United States 🇺🇸 on April 28, 2021*

4.2 sensor has gone bad two times in 2 years since install. No one should buy this guage because the sensor is not good enough for it.Complete waste of money!

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**Shop now:** [https://www.desertcart.co.uk/products/64475331-aem-30-4911-flex-fuel-fail-safe-gauge](https://www.desertcart.co.uk/products/64475331-aem-30-4911-flex-fuel-fail-safe-gauge)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-07*