Menumeters no longer works on El Capitan (see here), what are some alternatives? I just want to see my network and CPU stats.
I just ported MenuMeters for El Capitan, please go to http://member.ipmu.jp/yuji.tachikawa/MenuMetersElCapitan/.
iStat Menus has a beta going for El Capitan right now - it's a paid app, but will definitely do what you want. See link here.
There are also some cheaper alternatives:
hope it helps! :-)