temperature at 100

Hi
I have a 04 Z1000 that is indicating 100-104 degrees on the temp gauge. Fan is not cutting in .Fuse is ok . We did a 400k ride and temperature stayed at 68-70. Thinking of replacing the thermostat. The coolant level is ok . Any clues .
Thanks
I have a 04 Z1000 that is indicating 100-104 degrees on the temp gauge. Fan is not cutting in .Fuse is ok . We did a 400k ride and temperature stayed at 68-70. Thinking of replacing the thermostat. The coolant level is ok . Any clues .
Thanks