o2 Rear Sensor - Exhaust Problem

[sleepy2lazy]

95 GSX - Stock car for now basically.

I was removing the stock exhaust system and installing the Apex'i GT-Spec system. This was a pain in the ass to do as the exhaust was rusted to death. The stock cat was molting. The fluff was sticking out. But, Finally pulling it off today, one thing that happened during the job was the rear o2 sensor that connects at the mid-pip.

For my car, it was connected there, but as I was trying to move it, I noticed that it literrally broke off. I still gotta remove the bolt part off the stock mid-pipe as it is laying there, but the attachment from inside the car is hanging there.

I'm exhausted as hell from just trying to remove all the bolts and everything, but now i'm sitting here worn out thinking about the next steps, after I get the bolts to bolt up the system, i'm wondering if it is drivable.

THe question that I have is - Is it necessary to have the o2 rear sensor to be able to drive the car? Also, how easy of a fix will this be?

Any help is really appreciated. Thank You.