Random wires

I have an 83 1.8 GTI that I've bought and there are a few random, unconnected wires and hoping someone could tell me where they should go, any help is much appreciated

Would I be right in thinking the first photo with the yellow wire is for the oil pressure switch on the side of the head? (low pressure)

 

Can anyone help please?

I did some more digging around today and noticed that on the master cylinder (right hand side) there is a switch  with no wires connected, initially thought it was a single pin but on closer inspection it looks like it's a double but one of the terminals has broke off.

Question is, it this switch for the brake lights and are any of the random wires above supposed to go to this switch?
Thanks

Some help for you but electrical stuff is not my thing..

Yes 1st picture yellow is for the low oil pressure and needs a new spade connector fitted.

Picture 2, no idea..

Picture 3. The yellow wire with the red end fits onto the coolant temperature sensor on the front coolant flange.

Picture 4. Can't be much help as I have a different set on later cars but the black thing with the electrical connector is possible for the MPG reading on the MFA

For the brake light switch check if you have a switch on the brake pedal, early cars had 2 switches on the sides of the brake master cylinder

I will have a look tomorrow
Thanks for your help Mark