I've been reading alot on this subject recently as far as people hooking up their widebands through either the EGR or the AC Pressure lines and logging them through their tuning software without having to get "upgrades". I have been debating doing this however, I don't want to mess with the AC pressure deally (gets hot here in TX) and my truck doesn't have EGR.

My question is, even though my truck did not come with EGR, would I still be able to hook my wideband up to a "pin" on the PCM that would have supported EGR on similar models (say an 02 Silv. PCM has pin 55 as EGR Sensor, yet mine says not used, yet almost all other pins on the pinout sheet are identical between the two) and still have it work in the same way? Any info on this would be appreciated!

 

For anyone wanting to know, question was answered on HPTuners forum. Checked a 2004 8.1l Pinout; found the PCMs are the same, and pin 55 on the blue connector is the EGR Signal on the 8.1, but not used on my 4.8; therefore pin 55 should work just fine!