I'm working on a bench power supply that will have 2 adjustable outputs that have panel meters to monitor the voltage and current. the first problem i'm having is finding a switching solution for the ammeter. In order to switch between monitoring the current from source A to source B I would need a 4PDT switch rated for at least 30VDC @ 3A which isn't easy to find, nor is it cheap. originally I was planning on using N-channel mosfets but I'm thinking i need to have the source connected to ground. what other cheap switching options do i have? I was thinking about using a couple of relays but i'm not sure what kind of lifespan they have as well as how to find the right one. ideally i would like the relay to switch on at 5V. The second issue i'm having is my dual outputs. I currently have a power supply that has a 24VDC output @6.5A. I'm planning on using a couple buck converters to get my adjustable output of ~0-20V @3A but so far the plan is to get another power supply for the second output, which would take up a fair amount of space. Is there anyway I can take that single output and get 2 independent outputs from it?