Run the wires from front to back. It's very easy to do before the tunnel is all panelled in but not so easy afterwards.
You will need: brake lights, side lights, left indicator, right indicator, reverse, rear fog, number plate light (same wire as side lights) fuel pump (assuming boot mount pump) and fuel gauge sender, which may be 1 or 2 wires depending on the unit you have, you will also need to weld a bolt on somewhere to act as an earthing point. I had 2 earth points on my car - 1 each side. I also put 2 extra wires in, which I left coiled up, just in case I needed them in the future. I cut all wires a bit over length and then just terminated them as the build progressed.
Don't forget to include 2 wires for the reverse light switch (usually on the gear box) and the handbrake warning light - these both terminate half way down the tunnel.
Dave.
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