I'm trying my best to help, but I'm not fully sure I understand the question.
I can see one problem is a disconnect between some of your signal methods and slot methods.

The problem areas are lines 19 and 22.
Your slot methods need to have the 'int' parameter to match the signal methods.

Qt Code: 
  1. connect(celsiusDia, SIGNAL(valueChanged(int)), this, SLOT(setTempCelsius(int)));          // Notice the 'int' param
  2. connect(fahrenheitDia, SIGNAL(valueChanged(int)), this, SLOT(setTempFahrenheit(int)));    // and again
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