What would make the temperature gauge indicate hot on a 2004 Dodge Dakota if the thermostat has been replaced?
Have you checked for leaks? also the cooling fan may not be working.
I have a 1993 Dakota with a 5.2L and just changed the thermostat. Probably in the same place as your 92. Follow the upper radiator hose towards the engine. The thermostat is below the housing at the end of the hose. It is tucked in behind the alternator but with a long extension on your ratchet you can get at the two bolts that hold down the thermostat housing. Goodluck.