81 300D w/dead fuel & temp gages, etc.

A few minutes ago with headlights, sig. lights, AC, radio all on, my 81 300D suddenly lost fuel and eng. temp indications (both gages to 0 at same time). Also lost sig. lights and cool air. Flashers, compressor and heat/cool fan work, but sys blows only VERY hot air. I suspect a fuse, no light to check other symptoms, yet - flashlight is dead, too. Other than to keep fully charged flashlight handy, any tips? 'On the car, not the flashlight. TIA