UPDATE: Cleaned both sender and sensor and added additional ground to instrument panel. Gauge seems less twitchy and car runs above 80C (about 90c) in high 90's weather here in Northern Calif. Gauge was acting a little erractic with needle rising and then needle would drop quickly for no apparent reason at times, needle would act a little "twitchy" at times -might have been electrically induced. Will keep an eye out and will do a fluid change along with T-Stat change as it has been two years since last fluid service -thanks