Dash Power wire?????

I also believe the stock alt guage is broken or doesnt work, the guage face and needle are black does that matter? ok so i think i get this i should run a wire from my starter relay (which point) to an aftermarket amp guage under the dash then run power off of that to the guage cluster. Where do i connect a wire to the guage cluster there is no plug in, can i connect it to the back side of one of the studs that hooks to the guage(if you guys get what i'm saying) i'm getting this stuff finaly

edit: also can i run just a straight wire from the relay to the amp guage then to the cluster is that to much power should i put a circuit breaker in there somewhere?