Map reads vaccum, all engine create a vacuum while running.
Different motors make different amount but 95% run around -18 to -20in vacuum at idle, it can go higher on the negative scale to say -23 to -25 with drops in throttle.
Anything over 0 vacuum is postive, so boost/psi. Most stock L67 3800's make 6-7lbs of boost.
And our cars only use B1S1 and B1S2. As for bank 1 sensor 1 and sensor 2. We do not use anything that says bank 2 sensor 1/2.