I plan to build a bench supply using a used ATX desktop computer PSU, with 3.3v, 5v and 12v binding posts as well as a cheap voltmeter-ammeter combo module (DSN-VC288). I know it's going to be inaccurate and have terrible ripple, but it would still be a nice addition to the variable bench supply I already have.
Now, I would like to add a rotary band switch to toggle the voltmeter-ammeter module between the three outputs. However, passing the output current through the band switch is not an option, as the switch is only rated for 300 mA, and the supply should go up to at least 5A (will be adding fuses on each of the outputs).
I have a bunch of IRFZ44N MOSFETs lying around which can handle 35A continuous DC, so my first instinct is to use those to switch the currents when the rotary switch is turned. However, I wonder if I am overcomplicating it - or using the wrong tool for the job?
I am fairly new to electronics so it's very possible that there is a standard way to do this that I'm just not familiar with. Or is the MOSFET route a viable solution?