It's really easier than it sounds. It was a pain for me because I did exactly what you're doing right now. It took me longer to look at it and scratch my head than it was to install it. And trust me on the sensor. It'll do no harm not having it plugged in.
The thing you're looking at in that pic is not my horn. It's where the PO put the horn for the alarm. My car never came with cruise but maybe Thinair could tell you the best place to put the horn. I hope you don't give up on this. I've owned 4 different intakes in the 5 years I had the car and this one was by far the best.
Here's the thread that I started when I didn't know what to do. Hope it helps.