The water temperature gauges are pretty reliable. The temperature sender or voltage regulator is more likely to fail than the gauge. Why do you think the gauge is suspect?
There is some gauge troubleshooting info here: http://mhartman.net/files/sunbeam/fuel & temp gauges.pdf
Mike
There is some gauge troubleshooting info here: http://mhartman.net/files/sunbeam/fuel & temp gauges.pdf
Mike