Where do I get a lube bottle sensor?

Have my own stainless bottles but would like to keep the sensors...


Also, better to have the newer type or older type?

On the old style round bottle you could order the sensor separately (item #13) but they are hard to come by from Merc.
http://www.mercruiserparts.com/Show_...+OIL+BOTTLE%29

On the newer square oil bottle, the sensor is not separable.
http://www.mercruiserparts.com/Show_...+OIL+BOTTLE%29