Temperature gauge question

[ARNIE R]

For three straight years and approximately 37,500 miles, the Spyder has consistently displayed 4 bars on the temperature gauge after it has fully warmed up, no matter what the ambient temperature has been.

Today, it started fluctuating randomly between 3 and 4 bars. The 3 bar display appeared predominately during higher speeds, but, this too, was randomly.

Might this be because the thermostat is beginning to possibly “stick” slightly open on occasion, or should I just not concern myself with this unusual behavior? Everything else is behaving just fine.

[2dogs]

I think it may be the sensor but I'd check the fluid level first. If it climes past 4 bars or more you might have a spyder tech take a look at it. Also your radiator may need a cleaning. Too many dead bugs.