[F-127]

I usually disconnect the batteries when removing the PCM. Unplug the harness, it is secured by a bolt. Unscrewing the bolt will pull the plug in out. I think there are two other bolts holding a cover retaining the PCM in place for OBS(its been a while). You will need to pry down the fenderwell a little as the PCM comes out the engine compartment. Remove the cover on the PCM and clean up the contacts, there is a silicone type coating on there. Remove parking brake bracket, reinstall PCM, install chip, secure with some duct tape and route switch as desired. Here's some pics I took of the PCM and contacts on my install. Your right about the chip, not all positions are needed, more tunes more money. Comes with what you need except the hand tools used to install it.(note to the observant, the PCM pictured did not go in the pickup pictured)