j7 gkk

im trying to install the above into my v4 sti i have the loom colours and what they do i just cant understand where they go, ive got the positive an negative in and there is a blue wire and a yellow wire but cant find where they go, i think the blue wire goes to the back of the clocks as a positive on the speed sensor, but unsure where the yellow wire goes or if i need to cut a wire from the loom into the back of the clocks,

https://www.scoobynet.com/general-te...r-fitting.html

that has the colours of the wires from the wiring loom

any help would be great