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Just purchased this used 204fsx. 204 hrs. Runs amazing. Just noticed that the cooling temp gauge is not working. Worked the other day. What should I check? I’m pretty tech savvy so should be able to trouble shoot with your help. merc 4.3L is not getting hot. Exhaust is cool to the touch... hope someone can shed some light. First step I’m thinking is to check the temp sender wire. But not sure where it is? thanks all. happy boating