Well I am leaning towards this below as my problem and it was not overheating cause the temp gauge went back to normal in 1 second, it was just a false reading, time for a new thermostat and crossover pipe...………………………………………………………………………………………………………………………………………………………….
TSB
06-21-15 MIL ON - DTC P1285 / P1299 - 5.4L 3V / 6.8L 3V - FALSE OVERHEAT
Publication Date: October 13, 2006
FORD: 2005-2007 F-53 Motorhome Chassis, F-Super Duty
ISSUE:
Some 2005-2007 F-Super Duty and F-53 Motorhome chassis vehicles equipped with a 5.4L or 6.8L 3-valve engine may exhibit an engine temperature gauge indicating an overheating condition with the malfunction indicator lamp (MIL) on with diagnostic trouble codes (DTCs) P1285 and P1299.
ACTION:
Performing normal engine cooling system diagnostics in Workshop Manual, Section 303-03, if it is determined that the engine is not physically overheating (coolant expulsion), install a new thermostat and crossover pipe. They have been revised for improved cooling system flow characteristics.
PART NUMBER PART NAME
7L3Z-8575-A Thermostat - 5.4L
7C3Z-8575-A Thermostat - 6.8L
3L3Z-8C368-A Crossover Pipe - 5.4L
3L3Z-8C368-B Crossover Pipe - 6.8L
