I'm not sure why theres a reason to use a flow sensor. A decrease in flow results in increase in heat so just add a small thermister to the cpu block. The point is to kill the system when it gets too hot. A decrease in flow may not necessarily hurt the system too much so calibrating the cut-off point for a flow value is difficult.
For a water level sensor use the same sensor as you would to detect a leak but in reverse. Place the leak sensor in your res and when it no longer detects the leak then your water level has dropped. This could double as a leak sensor because obviously if your coolant level is dropping than that water is going somewhere.
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