Well I checked even further about the gauge and on Auto Meter's web site they list the same symptoms I was having to a bad ground. Long story short it is a bad ground. I changed the ground and the gauge stayed at 210 while the water was boiling. Thanks for all your help, I will know tomorrow or so when I crank it back up.
http://www.corvetteforum.com/forums/...ica-kinda.html