GMachinz wiring harness help, please?

[Funstuie]

I got a wiring harness from GMachinz about a year ago and I’ve only now got round to cleaning up the old wiring and installing the new harness. I’ve cleaned up the cab and installed the new harness from gmachinz but there’s a few plugs with nothing to connect to? I can’t work out what these should collect to??

Also there’s a port on the base of the steering column with nothing connected to it and I can’t work out what should be in there. Any ideas?

There’s also a separate wire coming out of the firewall and I don’t know what it is.

Sorry for the dumb questions but this has been a pain in the ass truck. There’s something new wrong everyday.