PanGu iOS 8 jailbreak tool(pangu.io) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, click pangu jailbreak that came out b4, cause it's in testing beta stage , plus hardly any jailbreak tweaks are compatible with iOS 8, so I would just wait until pangu is updated if your not sure what you are doing dont do it it's working fine with Cydia now getting installed too.
Tested on iPad Air iOS 8.0.1
Tested on iPad Air iOS 8.0.1