miroslav
Newbie
I obviously don't need them, but I am curious as to what type of simulators they are. I know that there are some simulators that are just a plug and play, and use resistors to make the voltage correct. The ones I made are mechanical as they use a small piece of the cat honeymoon material. IMO that is why they work so well. The rear o2 sensor still sees exhaust coming through the same material as it did when there was cats.
They were the ones made by Casper's Electronics and sold through Summit Racing back in the day. I'm pretty sure they are discontinued now because I can't find any info on them anywhere. They were nice back in the day because they had the factory style connector on them and they were epoxy potted, so no worries about them being exposed to the elements under the truck. I just unplugged the sensors and plugged these in. A little zip tie magic with the connectors and you couldn't even tell the sensors were not actually connected. Never had a problem passing a visual inspection.