You need to burp the system.
This, and hope you didn't warp anythingYou need to burp the system.
Depends on how hot it got. If you have good compression and are not burning fluids you are probably ok.Ya I didn't burp the first time. I did now and everything seems to be fine. Engine stays at operating temperature. When the gauge shot up I pulled over right away and turned the engine off in less than a minute. Do you think thats enough time to warp anything? Also how would I know if I damaged anything?