I'm in the process of buying an air fuel ratio gauge. I won't get it for another few days, but I'm trying to figure out, how I'll be hooking it up.

This is the gauge I'm trying to buy

Anybody has a clue how these things work?

 

It'll prolly be more or less useless being a narrowband and not giving a readout beyond lighting up, but I doubt it will be difficult. A few splices and you'll be set. You'll definitely need power and AFR input, but other than that I can't think what you could need to wire.

They work by taking the voltage from your O2 sensor, sending it to the gauge where it is reinterpreted into magical light waves, scaled arbitrarily, and then shown to you like a Lite Brite. That help?

 

All i want is to know if I'm running rich or not. Will it do the trick?

AFR input, I guess that can be spliced from the ECU right?

 

To the best ability of the narrowband sensor, yes. Remember, they're calibrated around stoiometrich, and their accuracy is something like 1.2pts. This is as compared to a wideband which is generally accurate to 0.1pts or thereabout and which can generally read from 8.0:1 to 17.0:1.

Yes. fkrzo recently asked about pinouts and I posted a link to the AEMPower forums with a detailed diagram of the 3g eclipse harness w/ pinouts (which are pretty much identical to ours), so check there when you need to know which wire to tap.