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NGK Powerdex AFX Wideband Air-Fuel Ratio Monitor is manufactured to make fuel delivery adjustment to the vehicle’s carburetor, mechanical fuel injection, or programmable electronic fuel injection system. It is constructed with durable material that ensures longevity. This monitor measures and displays air-fuel ratio from 9.00 to 16.00. It demonstrates response and accuracy within 0.1 AFR. It includes digital display unit, wiring harness, wideband oxygen sensor, boss and plug. This monitor specifically proves useful for carbureted engines and can be easily installed.
This set up is a tool and not a toy, it does not look cool and have funky neon lights to attract bimbos. It does not install into your dash like a gauge because it is an afr monitor for engine tuning and a damn fine one too. My one and only gripe is that it came with only one oxygen sensor bung and plug and I needed two. A very good tool for engine tuning.
I wanted something that was simple, accurate and easy to use. The AFX unit fit the bill. It comes complete and is easy to install and calibrate. I am very pleased with my purchase.
This is a no-nonsense AFR gauge. It plugs in, it works, it shows you what you need to know, which is great since that's all I needed.
My only, and biggest, gripe is that it peaks out at 16:1 AFR. Anyone who knows air/fuel ratios knows that that is a VERY small window for looking at the lean AFR.
This is extremely limiting when trying to set your lean cruise. Some carburetors run at 16:1 - 17:1 AFR for better gas mileage and you can't even see it with this gauge.
I also have a lean spike right off acceleration. How lean is it? Do I need a tad more fuel? Do I need a lot? I don't know. The gauge peaks out at 16:1.
Keep this in mind when purchasing this gauge because it is a big drawback. Other than that, it works fantastic.