Hi, I'd like to upgrade to the iAqualink system but don't know what kit to buy. I currently have the power center PCB#8124A with the PDA-PS4 8271 3.0. Serial in the power center is B07RSCMI0342. Can you help me figure out what do I need to purchase? Don't really need to be able to use my PDA as I will be able to use my smartphone instead. Thanks.