I recently purchased the auto meter carbon fiber air fuel ratio gauge. I called auto meter and they told me to splice my violet wire from the gauge into pin 52 or 26 on my pcm? i am guessing pcm is another word for my ecu? i was wondering if anyone could help me out on this one. any help is apreciated

Pcm stands for powertrain control module which is the same as the ecm. Personally i wouldnt even bother with the af ratio gauge. Its not gonna tell you much and you take the chance of messing up the ecm.