Universal Electronic Air/Fuel Ratio Monitor Meter Gauge Narrowband Blue Digital LED 2inches 52mm for Car Vehicle Automotive

I connected this to my unused narrow band O2 sensor on my 88 Samurai. It seems to function as intended, but I'm not quite sure just how useful it is being narrow banded. Of course, that's no fault of the unit and it seems to work well as intended. Also, the description wasn't quite clear that on startup it works as a system voltmeter giving the O2 sensor time to get up to temperature.

Works great having issues with my stock oil pressure gauge so I picked this one up. Only had one issue it didn't work after I started one day so I turned off my car then it worked again only happened once. Other then that it reads how I expected. Good item and nice to see my accurate oil pressure and not be concered.

Works good wish it came with a diagram in paper form

If you are lookign for an affordable do-the-job not-accurate way to read your air/fuel ratio, then this is the gauge for you. From my experience as a customer, I just wanna let you know some facts. This is a NARROWBAND gauge. Why? Because it reads only voltage ranging from 0.1 volts to 0.9 volts, which is enough for the gauge to say either your engine is running reach (0.1 to 0.23 volts) or rich (0.6 to 0.9), or what you expect, stoich (good air/fuel ratio, 0.45 volts). The problem however is that not much tuning can be done with these parameters. By the way, that voltage range is produced by the NARROWBAND O2 sensor (It generates voltage ranging from 0.1 to 0.9).If you would like a more accurate instrument, you want a WIDEBAND gauge and WIDEBAND O2 sensor. Why is it called "WIDE-BAND"? Because the O2 sensor generates a WIDER voltage, typically from 0.1 volts to 5.0 volts. That gives a WIDEBAND gauge a WIDER range to interpret, thus, more accurate.Back to this gauge, if it didnt bring the instructions like mine, then let me just tell you about the wiring: YELLOW to 12V+. BLACK to 12V- (or engine ground), RED to IGNITION 12V+ (if you plan to set fixed your gauge so it only turns on when the iginition is ON) and GREEN to SIGNAL cable coming from the O2 sensor. By the way, if the O2 sensor is 1-wire or 2 or 3 or 4, just make sure you know which the signal cable from your O2 sensor is.If you have any other question regarding this setting, feel free to email me at [email protected]

It's a narrow band and it's not very accurate. If you'd is flashing 10.0 constantly, you are running to rich. It only reads from 10.1-15 and you have to wait for the 02 sensor to heat up to temperature before it gets a reading. A wideband gauge and sensor are a better choice for accuracy and tuning.

Good Guatemalan for the money .. it’s a really good dealAnd the price is awesome .. easy to install

Not working just showing a reading of 20 with no movement.

Installed it in my ka24e hardbody,works better than expected,almost seems like I'm running a wideband. Pretty close to accurate,spark plugs prove it. If yours ain't working right,you either hooked it up wrong,you have a factory wideband and don't know it,or your o2 is no good. Sometimes you just get a lemon!