PCM is from an 03 express van. Cluster is from an 05 2500HD M/T. Everything works except for the voltage indication. It is supposed to come from the BCM or GBCM on the 05 from what I can tell. I have a GBCM or SAVRC from an 05 1500, but no luck yet. I see that 04 1500's feed the voltage to the IPC from the PCM. Can I get my 03 PCM to feed the cluster the voltage PID that the 05 cluster is looking for?