1998 Merc 200 EFI - Basic Rigging and Tune Up

[NeedOne]

Whats up Scream and Fly
Rigging an outboard for the first time.. got a couple basic questions

On mercury 10 pin cable, brown/white and tan/white wires.. trim & temp signals? which is which?

Center of first pic, white tee in vertical water line along stbd. head .. what would that be for?
There is a tube present from lower unit for water pressure.

2nd and 3rd pics.. starboard side forward of starter.. looking at Brass barbs..
Oil lines go to upper and lower barbs? whats the extra barb for up top?
and dumb question but worth asking.. does it matter which oil hose goes to each barb?

Thanks,