Hi Zodiac3818,
Just taking a stab in the dark here (not 100% sure whether it applies to your aircraft) but according to my Jabiru aircraft service manual for the J160C the Oil Temperature Gauge is an electronic instrument. They list a few methods for troubleshooting; check 10amp instrument fuse and replace if necessary, check 15amp main circuit breaker and reset if necessary, remove instrument panel and check cable terminals for security, check wiring at sender for security, replace sender or replace gauge.
Now I'm not 100% sure whether that applies to you as it's a different aircraft you own.
I hope this helped.
Andrew.
EDIT:
I also retrieved this info for you off the J160 pilot operating handbook for the 2200 (may differ because of engine cowl formats)
Red line minimum limit: 15C
Green arc normal operating: 80-100C
Red arc maximum limit: 118C
Yellow arc precautionary limit: 100C-118C
& Sorry for bringing up an old thread.