I just did this swap and found that the most cost effective way for the wiring was to get a used harness. You could just buy the wiring pins and connectors but you will spend alot more than the harness.
I bought a used lx450 floor harness that had the 5 extra wires running from drivers kick panel connector to drivers rear connector, by the jack.
On the donor harness, I depined the wires at the kick panel white connector and chopped them at the rear connector by the jack.
I then took apart the entire harness and saved just the 5 wires running from front to back with the 5 pins still attached.
I found a male connector on the donor harness that would to plug into the factory female connector on the rear locker harness that I swapped in. It only had 5 wires used out of the 6. I depined the wires in the connector and moved them around to suit the proper gauge of thickness. ( Two of the locker wires are larger for power)
Soldered that male connector to the 5 wires. (make sure to heat shrink and dielectric grease that connection)
I ran a separate wire loom right along the factory unlocked floor harness to the front.
At the front connector I simply pinned the 5 wires into my unlocked connector.
For the cluster you have to remove it and install 2 light bulbs / sockets. A quick trip to the junk yard to find any old toyota cluster will yield the bulbs and sockets. Get a few extra in case any of your bulbs are burnt. (the cluster can be removed without removing steering wheel, just search)
Installed the factory ecu, and magic dial.
I used the 96 FSM electrical drawings that had the connector pinouts. Note: some of the wire colors may be different so pay attention to the pin locations. Its also a good idea to dialect grease all of the connections.
This thread explains the 5 wires.
retro-fitting OEM lockers -Wiring Harness
Installing Factory Electric Lockers Into a 1993 FZJ80 That Did Not Come With Them From The Factory
good luck!