ok i got the tach going...now can anyone help me out with what wire is the primary o2 sensor wire so i can tap in for my air fuel gauge. the help is appreciated!!!!!

 

If it is the same in the s2000 as in the RSX.....it should be the white wire coming from the ECU. post this in the under the hood section and someone there will help you out. You should just check the helms manual and find out which wire does what.

 

You need to look at the 31 pin connector from the ECU. Look for the WHITE wire. It is located in the middle row in the middle cluster of wires. This is the primary O2 sensor signal wire. "T" tap into this and your A/F gauge will have a signal.
Page 11-55 of the Helm manual.
ps. This is the one I used for my A/F gauge. Works fine.