that first plug that goes to the fuse box does the
speed sensor
reverse sensor
other random sensor on box (netual maybe)
pos to turn alt on (white with red stripe)
and maybe one other thing i cant remember, i can prob have a look at mine if you want a better list,

i kept my fuse box but in insides dont resembale the stock one lol, i moved it all around to suit my requirments, i mainly kept it for the 70a alt fuse and matching wiring so i could upgrade all my headlight loom etc