I did the rev counter dials into a non rev counter Starlet before, all the wires i needed were there but not in the right order.
I did it by looking at the printed board/film on the back of the dials. All the copper tracks in the film were labelled at one end, where the screws went through to the dials, allowing me to work out what pin on what plug went where, on both sets of dials. I then sat with both diagrams I had made of the plugs and worked out what wires needed moving. The wires can be released from the plugs with their connectors still on them. They have a small "barb" that hold them in the plug, use a pin to push the barb down and you can pull it out.
Guessing the boost dial wires wont be there, they will need running, probably from the ecu.
Sounds complicated but sit with both sets of dials in front of you and a man of your experience will do it easy Chall.