http://www.mohdparts.com/emanage/manuals/japan_manual_software/51.JPG

click on that. looking under just the N-7 and N-9, what are the T1,T2,T3,T4's?

Also, what is the I that is next to them?

This is very important, anyone who knows, i will send you an E-Beer.

You should mention what car is the N9 diagram for, it might be easier for anyone who knows to help you.

Still, since I am e-Thirsty right now....

T1, T2, T3 and T4 are Ignition Signals for the respective Cylinders/spark plugs.

And I is definitely the RPM signal.

Chris