Brettinator

I hate the markup of these 02 sims @ 90 bucks, but I heard their being outlawed by EPA soon, being cheap not wanting to buy them but need a pair. The pcm looks for a variation in voltage from the o2 sensor. A resistor would only show a fixed voltage to the pcm. I've searched all over the net for a do-it-yourself for the fbodys with no luck.