i have true duals on my truck and i know the factory o2 sensor was mounted after the 2 manifold pipes came into 1 before the cat. so does that mean i have to put an h pipe in so the o2 sensor will read both sides without throwing a ses light or can i get by with just putting it on one side of the exhaust. my truck is a 94 chev k1500 ecsb 350 with true dual exhaust.