Originally Posted by
Shrek
Your 2004 full-size truck and your S-series truck use different methods to report oil pressure to the IPC (instrument panel cluster - or gages).
With your 2004 full-size truck the output from the oil pressure sender is reported to the PCM. The PCM then sends this information via Serial Data to the IPC. Because this data exists within the PCM, it may be monitored as a PID.
With S-series trucks the oil pressure sender is hard wired to the IPC. As this data is never within the PCM, it is not available to be monitored as a PID.