GenerationX1

Hey guys wanted to ask a question about this P0654 code problem I have. RPM on gauge cluster stopped working, MSD 2 step isn't working, Summit racing nitrous window switch isn't working and last but not least my Harlan shift light isnt working. I have checked all connections, pulled gauge cluster out to inspect connections and pulled pcm to inspect connections and pins. Everything seems to look ok from what I can tell. However, when I hook my scanner in the obd2 port to view live data my scanner reads and shows the RPM's working through it. Does that mean the pcm is ok if my scanner is picking up the RPM signal, or does the obd2 port get its RPM reading from some place else? I'm trying to determine if the problem is either my pcm or gauge cluster. I have another pcm that I can use but I may need to purchase another gauge cluster. I have searched and read everything I can and I think it's either pcm is tanked or gauge cluster is tanked. What are your thoughts on this? Thanks