You might need a small jumper to connect the horn. You can see where that connects on the picture in post #8 on the same thread. You can see the ~5 cm extension I made in post #7 (blue wire, large black rectangular connectors,) but it's just a 1/4" spade connector.
If you want to preserve cruise control, you'll need an accessory external cruise control wiring loom, and possibly new momentary contact switches. I've seen many different ways to do it. The wiring diag for the cruise is pretty simple and shown in post #8 above as well. Here is one option that looks pretty slick to me because it relocates it to the coin tray, but still uses the stock switches I believe: https://www.skyz-design.com/product-page/switchtray-for-nsx But there are a bunch of others as well.