1999 ford explorer gauge light has been on approx 4 days car won't start now

The gauge light is telling you something is wrong with your gauges! Testing is required to find out what is going on. As far as not starting -- A concern where the engine will crank but not start indicates a problem with one or more of a few areas. First, you could have a fuel delivery problem. You could have a lack of ignition spark. Engine timing could be disrupted. Engine compression could be compromised. Proper air intake to the engine could be interrupted or too plentiful. Testing hands on is required to find out what is happening.

You may want to enlist the assistance of some local techs near you. Here's a handy link to search for some local shops -- www.repairpal.com/repair-shops