Colour wiring diagram

Done, thanks guys. The oil pressure switch wire was confusing me…

 

It's one wire! Guess how it could work. Clue - almost everything in the van is wired the same way.

 

Yes, but the moment, at the time, wasn’t how it reads on here. Very busy day,with far too much going on, to to be confused.
Im sure you have days like that, too.

 

Nope. I'm a gentleman of leisure.