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It the motor a 2 or 4 stroke?
Would you please post the serial number of your engine so that I may look it up?
What type or brand of sending unit did you pruschase?
Does your boat have a water pressure gauge? If so, what is the pressure when running at WOT?
When was the impeller last replaced?
Has anyone looked at the tuner on the engine?
The tuner is actually the exhaust tube, it channels the hot exhaust away from the block. It is located inside the mid housing. These are sort of known that on an engine that is getting hot, the nylon in the lock nuts melts out and they fall off. There by blocking part of the exhaust of the engine. If it is either really loose or off, you can shake the engine hard when it is trimmed down and you will hear it rattle inside the bucket. Part 26
Do you still have the package that the sender came with?
Is this a solid tone or a beeping signal?
With no alarm? For how long without the alarm?
Is your boat equipt with a working volt meter? If so, what is the running voltage of the engine? Overcharge on a battery will also cause a solid alarm.
Has any of the techs used an IR thermometer to see if the engine is actually getting hot?