I just installed a new O2 sensor on my car (86 stock Starion at 7psi) cuz the old one was burnt and the wire was cut. after putting in the new one, i drove it but made no boost. only 0psi at full throttle. my turbo had complete turbo surge cuz the previous owner didn't have the original bypass valve. the car still was pulling 7psi of boost (have spare turbo). he also don't have a mass air flow sensor since he put in the aftermarket cone air filter.

what should i do to get my boost back? get Mass Air Flow sensor, BOV?
how does the O2 sensor effect the boost? I just want my boost back, thanks.....