wierd temp guage operation

[GREATCRUISER]

I noticed today after driving about 30 miles my coolant temp gauge went from normal(half way) to between normal and low. I am thinking it is the temp sensor i may be wrong. What you guys think it is good or bad(for the motor)? Any feedback will help thanks.

 

[GREATCRUISER]

wierd temp gauge

sorry guys i was driving my '91 cruiser

 

[lsloth]

Where you able to find the solution? My 91 just started doin this.