Low Fuel Indicator light on 1998 Ford Ranger XLT

I have owned a 1998 Ford Ranger XLT for over 8 years. In that time, I have run nearly out of fuel, but have never seen a light come on, indicating that I was low on fuel. My wife swears that today she saw it come one. Can someone tell me whether or not there is actually a low fuel indicator light on my 1998 Ford Ranger XLT? I insist there is not. She insists that there is. A lot is riding on this answer, so please be sure.