I've ran into this problem a few times in the last few months or so with 2005 Silverado's not having a way to log rpm. It show's the rpm/sae not to be available for that vehicle. Sometimes if I load an old file to them it will come back, but no real explaination to it. I was just wondering if anyone else has had this issue. I have sent an e-mail to support, just wondering how many others have seen this.