s2000 wiring help needed

[fastfu]

hi all
ive bought an s2000 engine and gearbox to go in a kitcar.
i did a lot of searching around for info before i started and got ecu pinouts etc but i have one plug that i cant find any info on

its in the loom with the 2 ecu plugs, this one

does anyone know what its for ? is there a pinout for it ?

thanks