2 part question ...I have a Aqua pure 1400 salt sytem with the older style square 1400 cell, I just purchase a replacement kit Jandy Ro452400 3 port it did not come with salt sensor that plugs into bottom port it is brand new in box , the guy i purchase from said you could use the existing sensor that your old system had and this kit has a plug which you leave in instead of connecting and purchasing $200 dollar sensor. The kit seems to have all parts needed , My question is will this work with the existing sensor that is inline before the cell and is there any other parts needed to install this plc1400 cell kit. I was reading that there maybe be a coupler kit that i will need, if so which one. thanks