I think everybody sleepy(A), I think mine one is 2004, i will check again its document :P.
I installed the temp gauge bcz this summer, when i had ac on at idle, the red light came on. Later found that radiator fan was nt working and then turned out that fuse was loose and only condenser fan was working.
Besides u get to know how the engine behave at different conditions. e.g i noted that at 90C the fans comes on.
And Like above 95 or 100 will be alarming state, if water temp never crossed this limit or it is dropped suddenly to 0 etc.