Get yourself an AFR meter!

Well, if you had joy with the narrow-band sensor, believe me, you'll love going wide-band!

That controll box sitting in-line on the sensor cable is a must. Not exactly sure what it does down in details, but the wide band sensor is active and requires some feedback loop controll etc to make it work. It is thios circuitry that wasn't initially available when these sensors appeared, thus limiting their use to auto manufacurers or the more advanced DIY experimentalists.

Yes, there are a couple of extra wires, but for running a plain out-of-the-box set up, you don't need to worry about all of them.

The first thing you have to do, is to calibrate the sensor it self. in order to do this, you need a 12 V power source and you'll need to wire up the sensor with a switch and a LED that comes with the kit. You just follow the instruction, it's really easy.

Once the calibration is done (you calibrate it towards air, I remember some of the DIY set-ups required calibration with different gasses etc...)

There is a RS-232 serial port interface for plugging the sensor directly to a laptop for those that want to use a laptop for logging AFR, using a laptop as a gauge, or for reprogramming the output of the sensor. If you're not going to do this, you can simply igmore it, the sensor comes with a factory pre-set anyway.

Once the sensor is calibrated, you can install it. hooking it up is simple. obviously, there is 12V power supply, one wire for ground and one for +12V.

then there is one wire that gives an analogue 0-5 voltage output corresponding directly to the Air-to-fuel ratio. This is what I plugged in to my EFI controller. There is allso a second wire that gives simulated narrow-band output should that be needed for some reason.

How the gauge that comes with the kit is wired, I'm not sure, but in theory, all it should need is a power supply and the 0-5V output.

So just follow the instruction and don't get dazzled by any extra wires or options you won't need and you'll be on your way to wide-band heaven before you know it!
If my experience is anything to go by, you will quite likely experience an "Aha!" moment or two as you start to see what is really going on in your fuel and combustion department! :)