Ok when I have two 200hp Mercury optimax the year 2002 my problem is that suddenly have beep alarm and the engine doesn?t run more then 2200 rpm aprox. On the display have no water pressure (zero) Have some experience but I can?t find what the problem is. The water pressure sensor is ok I tried one from the other engine and still the same, Have changed pieces, sensor from one to the other and nothing, the beep is there. Have oil in the tanks, impeller is ok,have disconnected the temp sensor well? Don?t know where to go now. This is a fuel injectin model. In low rpm the beep sound three times
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