Cody,Filter pressure on low speed...I'll include a picture because there are only three marks before the 10....if they are 2 each, starting with 4, then it's 5 psi.....weird that there are only three marks before 10, but normal marks after...Why did you ask for this number? Will this help determine if it will generate chlorine on low?
Power cable -- he said when he unhooks the booster pump he can use that power to that pump to power the power pack for the cell instead of running another one (the run is about 10-15 feet, so it would save money i guess).
Just a side note. The front rim of that gauge spins and has markings on it to note where the needle points to when it's at clean pressure. You align the clean mark to the needle when filter is just cleaned and it'll show you at what point filter has to be cleaned when it reaches the DIRTY arrow.