[tater]

I have an 1982 Gl1100I the temp gage has always work till this year know it barley come off the peg .
Yesterday I took the bike out and rode 40 mile the ambient temp was 87 degrees and it would come up just a little.
The fuel gage works fine so it's not the fuse I guess I'm kind of lost here has anybody got any ideas.
Thanks Tater