This black and red wire I think it connects to starter motor - Yeah, but is this a Mk3 loom as that looks like a Mk3 starter connection. Good upgrade mind as it's better than the Mk2 one.
This is a yellow wire with a spade connector and a green and black wire with a spade connector - Top of oil filter housing, ones oil pressure one's oil temp I think.
This is a brown and white wire with a ring connector and a blue and black wire with a spade connector - Ring connector looks like an earth, blue and black goes top of oil filter housing, other oil pressure sensor I think.
We need Rubjonny back, he'd know all of these off top of his head!