dash wiring change over

[easyrider]

with the help of 70shortfleet I have been transferring the wires plug to back of dash from idiot light to gauges. I have everything changed except for #8 brown wire. also, #1 and #12 black wires I don't have. I've read posted articles but no one addresses what to do with the brown wire. They do say to do away with blue #1 wire from idiot harness; not needed, but no one says anything about #8 Brown. Can someone tell me what to do with #8 brown and explain what to do with #'s 1 and 12 empty pins? You will have to explain it like you are talking to a 4th grader so I can comprehend exactly what to do..lol !
Thanks for all the help I have received from this forum, invaluable source of help from some very smart people...