Thank you for such quick response. I realize that the IAC drivers are unrelated to the AC request function. However, according to LT1SWAP.com, only PCM's with IAC hardware will allow for the Analog AC request function (as opposed to the serial). My old truck don't know from serial, so I'd like to switch to the analog, 12V AC request mode. What I'm asking is since most OS's in the 2004 years expected to use serial, don't I need to configure the OS to use Analog? And if so, can that be done in TunerPro?