Just a small update, got my ULN2803 in the mail and soldered it inline to control the last 8 outlets. Finally received my connectors for the temp sensors and they aren't the correct type. Placed a new order tonight to replace them, this time I made sure and ordered ones that had prime shipping so no more waiting a month for parts. Went ahead and got 1 temp sensor working for testing purposes and everything seems fine I'll just need to attach a plug to it once they arrive. Still have dosing and my PH board to do but waiting on various things before I order more parts.