I did this mod to my Avast Marine Deluxe ATO because it was set up to be controlled by the apex when ordered. But now later down the road after selling my apex controller, I needed my ATO to run solo from the controller. Tools Needed: *Disconnect from any power supply* 1)First you will have to disassemble the pump housing by taking out the 4 screws on the back of the project box. 2)Cut wire One and Two (Pressure Switch to APEX) on the apex wires One and Two attach Two twist on wire connectors. 3)Now cut wire Three(Hot-Red) Attach wire One to wire Three(coming from the power supply) also using twist on wire connectors. 4)Do the same with wire Two and Three(coming from pump motor) Done. Put back together and enjoy stable salinity and not running your pump dry because you forget to Top-Off. Hope this helps someone down the road. Kyle.