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Sorry, apparently I wasn't clear - the mention of FADEC was regarding newer engines which do have electronic protection of rotor speeds and burner pressure. The JT8D is purely hydromechanical and only has N2 redline protection (basically a flyball governor) and some sort of rudimentary burner pressure protection.
My point was that even with the fancy new FADEC engine controls, we don't limit for EGT (except perhaps during starting) because exceeding EGT redline is primarily economic damage - it would not cause the engine to experience an uncontained failure which could endanger the aircraft (which may occur with a rotor speed or burner pressure exceedance).