[ls1nova71]

There are a couple of ways to add the NSS. If you have a van tilt, then it should have a switch on it, although the first van tilts didn't have them, but they are not that common. But, a van tilt has the switch too far up, so it will hit the brake pedal/column mount unless you shove the column all the way into the dash. You can cut a new slot in the column and the shift tube, but its harder to do with the column assembled, but I have seen it done, so I know it can be done, but definitely easier to do with the column taken apart, downside is it has to come all the way apart, which if you haven't done it before, can de a daunting task, but again, very doable with persistence.

The other way would be to to add the trans mounted switch and wire it through a starter relay, which is a little more wiring. Also, depends on what transmission you have. Cars have a short shift shaft that won't accept the trans mounted switch, so bear that in mind as well.