Airbag light?
I don't think there is one.
The '95 & '96 (yes, there are two years that share that steering wheel, and some ZJs also have one which I think is almost identical and can be swapped with a possible minor modification) use a mechanical airbag. You won't find any of the special yellow wires under the dash of a '95 or '96 XJ. To try to add a later model steering wheel/airbag would be a very substantial undertaking. You would need sensors, wiring and computer control. I expect it would be simpler to just buy a late model.
It may be possible to go backwards and install a non-airbag steering wheel, but from what I can recall when I looked into this there are issues that come up with the turn signals. I also wonder how an insurance company would view such a modification.