Tachometer install on s14a SR20DET??

[hiszpan_han]

Hello, i have a problem with installation of a 5" defi tacho. I don't know what pin from ECU is the tachometer signal. In documentation for kouki is another tachometer, my ECU is also other. my original tacho looks like this:

http://www.prodigy1.com/stuff/parts/parts3.jpg

http://www.sidtech.co.uk/iu/B19TRB050644998739.JPG

Image

in documentation is notching.
My ECU A18-F42 G64
part nr. 23710 82F05

I need help, information, documentation anything...
My car is a Nissan 200sx(240sx) s14a kouki, j. 1997, SR20DET