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overheating on 2000 Jeep Wrangler

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my 2000 jeep wrangler, 4.0 engine is going into the "red zone/check gauges zone". i have changed the radiator, flushed the engine, changed the thermostat and fan clutch. any ideas as what to check next?
(1) Answer
If the engine truly overheating? This might be the temperature sender failing. Here's a guide for the coolant temp sensor but I would test that with your multimeter before replacing so you don't waste any money
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280221709

If the engine is truly getting hot, I would be looking at the water pump next. That's really the next in line if the new thermostat is opening normally. You're sure you've got the cooling system completely filled?
hope this helps