stock gause is in Hgmm... it is neither psi or BAR.
as a general guide, the +7 is about 1 bar.
stock RB20det in good condition runs a standard of 10psi boost.
1 bar = 14.7 psi
therefore 10 psi = about 0.68bar
so in an auto, and on a possibly 15 year old car, and 15 year old turbo with 15 year old wastegate spring, getting 0.5 bar (which is 7.35psi) boost is not so bad.
you haven't said what mods you have so I am assuming stock.
if you get a better air filter, and a full exhaust, this will bump up the boost to about 10psi I guess.
OR.... Maybe the Auto's run less boost.. Not sure..