Originally Posted by Will Pedley

One of the white wires needs to go to the fuel pump relay output so the lambda is only live with the engine running as it draws a lot of current and is actually cooled by exhuast gas.

The other white wire needs to go to a good clean ground.

The black wire needs to go to Pin 2 of the ECU connector. (I say Pin 2 as I have a good memory and ths is deffo correct)

The two white wires form a heater circuit and the black provides the switching voltage signal into the ECU.

Hope that helps