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My 98 Chevy K30 Dually does the same thing. Reads 240 on the guage and the check guages light comes on. I have stoped by the Radiator shop three times and they put a thermometer in the radiator. Each time it read 180 degrees, so either the sender is bad or the guage.

You should be able to take the top radiator hose off and it should gush water when running. Take it loose at the tank and raise it up so water does not run out. It will have to be at operating temperture or the thermostat will have it blocked. Then again, if the thermostat is in backwards it...

Bjorn, I was thinking since he put in a new Radator and changed the water pump maybe he fixed the problem but created another one by installing the thermostst wrong.

Are you sure you got the thermostat in correctly?? They can be installed upside down or can in most applications. I have also heard of new thermostats being bad. If you pull it back out you could check it in boiling water to see if it is opening at the correct temperture.