My car was broke down on the side of the road and someone cut the cat converter off all the way to the motor and i had to get a straight pipe ran to it... when they cut off the converter they also cut off both oxygen sensors on too.. a friend of my said that I could go to radio shack and get a dyno something for it to fool the computer for the o2 sensor ... but they said that i would need to know which one to get... the car is killing me in gas I need to do something just for a temp fix, please help