--- product_id: 441566846 title: "GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover" price: "FREE" currency: TND in_stock: false reviews_count: 13 url: https://www.desertcart.tn/products/441566846-goolrc-digital-air-fuel-ratio-gauge-kit-12v-2-in store_origin: TN region: Tunisia --- # 2-in-1 functionality 12V compatibility Easy installation GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > πŸš— Elevate Your Drive with Precision Monitoring! ## Quick Answers - **What is this?** GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/441566846-goolrc-digital-air-fuel-ratio-gauge-kit-12v-2-in) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Crafted from high-quality plastics for durability and anti-aging. - β€’ **Stay Informed:** Dual display for air-fuel ratio and battery voltage at a glance. - β€’ **Universal Fit:** 52mm gauge fits most cars, trucks, and motorcycles effortlessly. - β€’ **Optimize Your Ride:** Enhance vehicle performance with real-time air-fuel ratio monitoring. - β€’ **User-Friendly Design:** Simple installation process for a hassle-free upgrade. ## Overview The GoolRC Digital Air Fuel Ratio Gauge Kit is a versatile 2-in-1 meter designed for 12V vehicles, providing real-time insights into air-fuel ratios and battery voltage. With a durable 52mm gauge, it’s perfect for car enthusiasts looking to enhance performance and safety on the road. ## Description Product description GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Acces White cover Review: can't beat the value - Worked awesome for tuning my dr650. it is narrowband, not wideband so reading on the rich side is not as good...only goes down to about 11-12 AFR. So start lean 15+ and slowly richen each circuit to 12-14. I didn't even look at the instructions based on other reviews...follow the wiring as outlined in other review. Review: Use the wiring suggested here in the comments - Works. Installed it on my carbureted ATV to get an idea on how it’s tuned and maybe dial it in some. Super cool. Shows AF Ratio as soon as the sensor warms up. LED colors for AF Ratio are deceiving. The higher grams of air per gram of gas are represented with red LEDs. Ie 18-19-20. So lean shows red LEDs. Close to Stoich are amber LEDs. Rich mixtures are green LEDs. Ie 10:1. I had one of these years ago on my Honda civic. It was an expensive Auto Meter and I’m pretty sure the LEDs were reversed. Red = Rich and Green = Lean. LED colors are correct. Remember now and I get the RED = Lean. Shooting Nitrous on my civic I wanted to be rich so seeing Green means good ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09ZYJLK6N | | Best Sellers Rank | #1,004,488 in Automotive ( See Top 100 in Automotive ) #74 in Automotive Replacement Air & Fuel Ratio Gauges | | Brand | GoolRC | | Customer Reviews | 3.9 3.9 out of 5 stars (92) | | Date First Available | May 10, 2022 | | Item Weight | 10.6 ounces | | Item model number | XET8324280782382AP | | Manufacturer | GoolRC | | Manufacturer Part Number | XET8324280782382AP | | Package Dimensions | 6.69 x 4.8 x 3.31 inches | ## Images ![GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Image 1](https://m.media-amazon.com/images/I/51V2GRwEU9L.jpg) ![GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Image 2](https://m.media-amazon.com/images/I/51oWcxsHkZL.jpg) ![GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Image 3](https://m.media-amazon.com/images/I/514psUSyxXL.jpg) ![GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Image 4](https://m.media-amazon.com/images/I/41RqUTFrN5L.jpg) ![GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Image 5](https://m.media-amazon.com/images/I/5129diQ0D6L.jpg) ## Questions & Answers **Q: How do you switch between voltage and air/fuel mixture?** A: Mine reads voltage for about 30 seconds until the sensor warms up, then switches to A/F mixture automatically. ## Customer Reviews ### ⭐⭐⭐⭐⭐ can't beat the value *by J***N on June 18, 2025* Worked awesome for tuning my dr650. it is narrowband, not wideband so reading on the rich side is not as good...only goes down to about 11-12 AFR. So start lean 15+ and slowly richen each circuit to 12-14. I didn't even look at the instructions based on other reviews...follow the wiring as outlined in other review. ### ⭐⭐⭐⭐⭐ Use the wiring suggested here in the comments *by J***. on May 25, 2024* Works. Installed it on my carbureted ATV to get an idea on how it’s tuned and maybe dial it in some. Super cool. Shows AF Ratio as soon as the sensor warms up. LED colors for AF Ratio are deceiving. The higher grams of air per gram of gas are represented with red LEDs. Ie 18-19-20. So lean shows red LEDs. Close to Stoich are amber LEDs. Rich mixtures are green LEDs. Ie 10:1. I had one of these years ago on my Honda civic. It was an expensive Auto Meter and I’m pretty sure the LEDs were reversed. Red = Rich and Green = Lean. LED colors are correct. Remember now and I get the RED = Lean. Shooting Nitrous on my civic I wanted to be rich so seeing Green means good ### ⭐⭐⭐⭐ It works. Appears to be accurate. Instructions lacking, but I am posting below... *by M***N on February 21, 2024* Minus 1 star for missing instructions for wiring the sensor. It dos include instructions for wiring the gauge, though. Also annoying that it shows battery voltage for the first minute, before it switches to A/F ratio. I guess it does say "2 in 1... car voltmeter..." So I can't count that against them. Sensor wiring: Black -> green wire on gauge (sensor reading to gauge) Gray -> ground (sensor's ground) White -> ground (heater's ground) White -> +12V when ignition on (heater's +12V) (Notes regarding heater: A/F ratio sensors (aka O2 sensors) need to be hot enough to read accurately. The heater inside the sensor heats it up to operating temp. A vehicle's computer will switch the its O2 sensor heater on as needed, but you're not connecting this to the car's computer. So, you can connect it to ignition +12V. It is okay for the heater to stay on with the ignition.) Gauge wiring: Red -> +12V when ignition on Yellow (backlight)-> +12V when ignition on or +12V when instrument cluster lights on. Black -> ground Green -> sensor's black wire Make sure you install the sensor as far up the exhaust gas stream as you can (closer to engine better). If you install it too far back, things will give it inaccurate readings. For instance if you install it too close to the end of the exhaust, you will get lean readings (high A/F ratio number) because as the exhaust pulses, it sucks in some ambient air. I tried making a "sniffer" that inserts into the tailpipe and found I have to insert the sensor at least 18 inches into the pipe before I got what could be accurate readings compared to installing it into the exhaust downpipe after exhaust manifold. ## Frequently Bought Together - GoolRC Digital Air Fuel Ratio Gauge Kit 12V 2 in 1 Meter 52MM Narrowband Car Volmeter with O2 Oxygen Sensor Car Modification Acces White cover - Ledaut M18X1.5 Bung and Plug Notched Style Stepped Notched Style Mounting Bung and Plugs (1 Bungs/1 Plugs) - LEDAUT M18X1.5 Stepped Mounting Bung and Plugs Stainless Steel(2 Bungs/2 Plugs) Fittings Weld Bung --- ## 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.tn/products/441566846-goolrc-digital-air-fuel-ratio-gauge-kit-12v-2-in](https://www.desertcart.tn/products/441566846-goolrc-digital-air-fuel-ratio-gauge-kit-12v-2-in) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-08*