connecting air/fuel guage

Hey guys im new here. i have recently purchased an autometer air/fuel ratio guage and iam now trying to install it. the problem i have is where to splice into the o2 sensor wire. where is the best place to do it?
any advice will help
thanks

btw the car is a 89 civc cx hb of course.

at the signal wire where it goes into the ecu.

yea i have no idea which wire it is being there are 2 clips with how many wires on each. also where to splice.

according to the pinout i just check its the wire located at C16 on the ecu. to find that wire look at the 3 plugs going into your ecu, from left to right they are considered A,B,C

so the one on the right is plug c. then from there you count the slots, looking at it from the side the wires go into it you count like this

135
246 etc.

how can i get a hold of that pin out? can u send it to me? my email is [email protected]. iam an electrican so wiring diagrams are pretty easy for me. thanks

i got it from here - http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/14/1e/ad/0900823d80141ead.jsp

find the 88-91 civic engine wiring diagram.

is it ok to un plug the harness from the ecu when im connecting? also will a butt connector be fine or should i solder? thanks any other tips are much appriciated i wann do this the right way

i would solder, you wouldnt want a crappy connection there.

and is it cool to unplug the ecm?

yea its fine.

so i found the plugs to the ecu. but cant determine the correct wire. there are three plugs. one big beige one, one middle black and one smaller black one. which one is the o2 wire? i found like 2 white wires but cant determine how to find wire "c16" plz help thanks