Or you could pick up a cheap wideband.

So is the GSR ECU you bought Spoon chipped? If so I'd buy a cheap chip with modified vtec settings and revlimit and throw that trash away.

It's not for street use, runs pig rich, destroys your gas mileage, and disables the check engine light in almost all situations. The ECU was designed to keep going no matter what... if something goes seriously wrong with your motor, it could be trashed before the ECU lets you know you just destroyed your engine.