Hi, the obd1 is different to obd2. youll have to remove the dash (makes it heaps easy) - remove the brake booster (to pull the loom through the firewall), take photos of the fuse box and then start unplugging.
So you need the:
1.Fuse box
2.Complete loom
3.Depending on cluster with mfi - that white loom to.
4.Ecu as well.
You will need to get a new brake booster retaing clip (white washing peg looking thing,ebay).