I don't have completed pics with loom on and harnesses tacked yet,still adjusting and messing with stuff.
I cut alot of wiring from that fusebox area and coming out of the firewall connector. There was 14g wire (4x) going from under the dash/spliced into N/S and Rev switches out the firewall,down the tranny tunnel,under the truck and then thru a hole drilled in the tunnel below seat and then terminated with spade connectors (wouldn't fit thru hole).
All this,instead of running a 12" wire from where they spliced to where they ended up-inside the truck.
I have a pretty good pile of wire,basically everything I dealt with I cut out and started new if not stock.