For those of you swapping to a momo/sparco style steering wheel, here's a few things that will help.
The horn wire in ALL 240sx's is the green w/ white stripe. This wire is located in the yellow wrapped airbag harness coming from beneath the steering column. If you splice out this wire, you can touch it to any ground in the car(metal anywhere) and it will trigger the horn. I would suggest wiring it to a cheap toggle switch you can pick up at auto-zone or walmart etc.... Hope any of this was helpful...
btw...UNLESS YOU ARE INTELLIGENT, DON'T EVEN MESS WITH THE HORN BUTTON ON YOUR STEERING WHEEL, TOO MUCH TROUBLE, TOO MUCH TO GO WRONG....
