Gauge reads around 210

[beattie]

97 gtp gaskets were replaced and the cooling temp sensor got broke so i replaced it now it reads around 210 never read that high was always around quarter of the way i opened the bleeder valve above the thermostat and places a thermometer in the anyifreeze comin out and it only read 180 ... Does it mean my sensor is bad or something else... I also have a 180 thermostat and programed pcm so fans kick on diff now