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Ok, so Im replacing the o2 sensor, and will get a 3-wired heated.
I know there are many threads about this, but still cant the exact info I need.
Im going to wire the switched 12v+ to the Fuel pump relay.
My car is an 88 GTA, and it seems that the wiring colors are different for different years...
Here is what the relay looks like:
Connector:
Which wire from the relay connectors, should I splice?
The wire colors are:
Tan/White, Black/White, Dark Green/White, Orange, and Orange(Red).
The large Tan wire with the white tracer is the switched lead from the relay that powers the pump . Going with your plan of hooking it in parallel with the fuel pump , use that wire .
I'm going to sound pompous or like I have a better than tho attitude but I mean well, I'm guessing if you're asking this you don't know how a relay works and you don't own a digital multi meter? It would really be helpful to you to spend an hour to do a Google Search and read the information about how a relay works and wiring relay projects. And any digital multi meter works fine when you're just starting out.
The large Tan wire with the white tracer is the switched lead from the relay that powers the pump . Going with your plan of hooking it in parallel with the fuel pump , use that wire . 
