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I want to rig up a loss of coolant sensor for my 2015 3.5NA Taurus Limited in case I have water pump failure or leak as the water pump is internal and grenades the motor from hydraulic forces before the temperature gauge can go up.

1 Is the reservoir/pressure tank even the correct place for said sensor. When I drained the radiator, the tank never drained. After refilling, the coolant seemed to siphon out of the tank at a certain height. 

I wonder if the damage would be done with water pump failure before the tank lost enough antifreeze to trip a sensor.

2 Is there a better place the sensor on one of the lines near the thermostat? Or maybe a Large Tee in the upper radiator hose?

3 I have found some Amazon stainless steel GEM style sensors for cheap enough (long shaft with floating SS donut around shaft). Seems I could drill a hole in top of the reservoir and still retain use of my Pressure Cap.

4 I have seen where others use a plastic piece with a floating lever/bar. That means drilling a hole in the side of the tank below the water level. Not as appealing.

5 I thought about installing a Gems sensor in the (easily replaceable) cap, but then I would lose the 18psi pressure relief and have to add something in a hose (possible).
6 Should I tie in series with the oil pressure sensor so low water would show up as low oil pressure !!! to get the point across to whoever is driving? 

I see only one wire to the oil pressure sensor, so I am guessing it makes connection (signal current only) when there is pressure and is open when low pressure (fail safe). So if I put the coolant sensor in line in series, it would cut the signal. I have no idea how amps, volts, and resistance come into play here as I have no specs on the oil pressure switch circuit.

7 Can I just use the right side headlight for a power source to the switch then an audible amazon buzzer since its only on when the engine is running (Auto lights is always on). False signal or maintenance alarm could be silenced by cutting the lights off. The sensors want no more than 0.5A so It might mean a relay if I can’t find a buzzer with that low of a draw. An engine on key on power source would obviously be preferred. 

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