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Originally Posted by igzy
Puppetmaster - Great write-up and nice pics too!
One note I would like to mention is that you may not need to tap into the main wiring harness before the connector going to the sensor. I installed mine by tapping into the wiring after the connector, just before the sensor itself and the simulator works fine. I used a single output sim on the secondary O2 after the main cat on fed spec...
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The main reasons for my doing the tapping and cutting before the harnesses are:
1. It it will be easier to cover up when I go back to stock since all I have to do is remove the sim and tape everything back up (and resolder the white wires). When you have to rejoin O2 sensor wires, its hard to fit the colored shroud/wrap back over the joints (unless you can do it with really thin layer of solder and thin heatshrink/tape). Then again, I'm not an expert with soldering, so maybe you people who are good at this won't face this issue. I just think leaving the O2 sensors intact is a good thing.
I also liked how neatly I could tape the sim back with the wiring.
2. I find that the copper wires before the harness are much easier to work with than the steel or whatever wires on the O2 sensor itself. I cut off one of my O2 sensor's wires, and I hated soldering those slippery wires back together. So I would just rather not have to deal with the O2 sensor wires as far as possible. And once again, maybe those better at dealing with such wiring may not find this a problem.