Can't seem to access other parts of website, SO, will ask here. Need to replace thermostat on 200 hp merc. out board. Need to know where it is on engine, Is it something I can replace? is there torque -foot pounds-inch pounds, involved? When i first run it up,the buzzer goes off, "low oil or over heat" guage reads 3/4 hot, then drops to 3/8s, then guage varies before opening and closing