Okay my buddy and I just finished installing guages in his DA integra with a JDM B18A. For the air/fuel we just did power/ground then ran a wire to the single wire, non-heated o2 sensor that's in the exhuast manifold from the factory. Seems to work just fine. But there was a CEL I think it's from the water tem guage though...

For the water Temp guage we again ran the Power/ground (all to the same place I spliced the wires together so we just ran one power and one ground for the guage pod.) Then we ran the signal wire to the engine bay and spliced it into the white with blue strip wire coming out of the green clip going into the thermostat housing. My buddy assured me that it was the temp sensor, but I think it was the fan switch. Anyone know for sure? It threw a CEL but, we didn't have time to check. And, whenever his car is off his A/C fan (driver's side) is constantly on. We had to unplug it to get it to stop. Thanks in advance for any help.