I just got a simulator for the evo and i just happen to have the fields harness too can i wires the simulator to the harness instead of the sensor it self under the car...??

for example the signal would be pin #75
and the 12v power would be # 25


could this work.....?

 

You should be able to hook it to thr harness. #26 is ground also. What model sim did you get, where and how much? I've been looking for one too.
Don't just splice it in, cut the O2 wire and connect to ecu.