dont want to really risk that as it does turn on the second gpu, as the lights on the gpu come on. one thing i should note is that the new psu has a 20+4 connector, the add2psu uses all 24, maybe if i just plug in 20pins? im really stumped
It's not that risky. All you have to do is make sure you put the ends of the paper clip in the right spots. However, I don't want to encourage you to do it if you're uncomfortable with it. (Since nobody on this forum is liable for damages caused by following their advice.)
By the way, what GPUs are you using, and what are your other system components?