If you had a pound for every correct reading temp gauge in a cossie you'd be a very poor man!!
Seriously they are notoriously inaccurate, my fans cut in at 95C, by the ecu, and this can vary wildly on the gauge from bottom of the M to half way through the N, but all the temp is the same!!
If the fans are cutting in and going off then I wouldn't worry, you have the std cossie feature a lying temp gauge!!
tabetha