Don't forget to plug the lightbox back in.
Now you need to replace the instrument pod into the dash, feed the wiring in, positioning the transformer where it won't knock or flap about.
Refit the four screws to hold the pod in place.
Now you need to decide where you are going to position the control switch/dimmer.
You can see my position here.
Refit the cowl.
Now you will need to pick up a live from the sidelight/instruments circuit and an earth.
Interestingly,
the middle spare connection between the two I used for the heated seats is a suitable live.
The three connections are, left to right 1/.ignition live 2/. Lights live 3/. Permanent Live.