For users of Torque Pro, I was able to find the (hidden) PID for Oil Pressure. This works on my 2005 Yukon XL using. I think they changed the PIDs in 2006 as the standard GM PID provided in the extended PIDs in Torque does NOT work on my 2005. You'll need to go to Settings-Manage extra PIDs/Sensors-...-Add custom PID to enter the following values PID: 22115c Long Name: Oil Pressure PID Short Name: Oil Pressure Minimum Value: 0 Maximum Value: 100 Scale: x1 Unit: psi Equation: (A*0.65)-17.5 OBD Header: Auto I cannot take credit for figuring this out. I poached it off the LS1GTO forums (user GTOzilla) I have confirmed this matches the dash gauge closely, but don't have a ScanGaugse or other tool to validate this.