1999 7.4 MPI. 15 hrs. Alarm goes off when above 1000 RPM. Cold engine it takes 10 minutes, hot, it takes about 5. Beep is every 3 seconds. Even tho this engine is basically new I replaced water pump, thermostat, backflushed all the lines. Outdrive oil is full. Oil pressure is good. Water temp is between 150 and 175 depending on RPM. Doesn't matter if I use hose or put in the water. A couple of things to help. 1- If I shut off engine and immediately turn it back on it takes the few minutes to sound alarm again. 2-It runs perfectly all thru the RPM range,even above 4000. Does not act like it's starved for fuel. Thanks for any ideas. Also, what's the best way to test the sending units and the oil res. unit.

There was a post awhile back about certain plug wires interfering with the knock sensor. Maybe someone will chime in with the details.