welcome, you have come to the right place.
try the search function too, this has been covered in quite a lot of detail a few times.
Good luck!
oh, most importantly... PICS PLEASE!!
0.6 bar is 8.7psi, so yeah you have about8.5 as its a bit under 0.6.
and yes that sounds about ok. depending on variables/mods...
oh, and that aftermarket gauge is 'bar' which is pretty commonly used as well as psi.