Outer Limits 4x4 Board

Hey Everyone

I'm chasing some advise on taking the wiring from a combination switch for indicators, high/low beam & wipers
putting them on there own switch
the reason i'm doing this is because i put a custom dash into my Gen 2 hilux and the old combi switch wont fit anymore

i need to know how to find out what wiring does what?
how put the switch's in?

really any advice would be good i'm not much of a auto wiring bloke

thanks