2 O2 sensors?

Hey all, I'm doing a B16 swap and, for the first time ever, I'm using a pr3 ecu. The only problem I have is that it is looking for 2 O2 sensors. Is there a way around this, or will my guy have to get a second O2 bung put in his header, or what? I've always done these with other ECU's, so I've never had to address the issue before. Let me know if there's a good solution to this, or maybe a capacitor or something that will simulate an O2 sensor to the ECU...

weld another bung onto the header.

or you could chip the ECU