I tore apart my cluster again... Bench tested it with a 10vpp square wave going to the speedometer pin A7.
Removed all modules not related to the gauge to see if one was interfering.
I also gently pressed on the board in various spots to see if possibly a trace or via broke or delaminated.
Additionally, I probed the square wave to see if something was corrupting the input. It's clean at least at the header.
Still have same issue, speedometer will not respond.
I see there's a serial data pin on the cluster. I tried wiring that directly up to the VX nano adapter.
I wondered if I could do anything with Tech 2 or PCM hammer to scan the cluster, maybe the software on it just got corrupted? Or if I have to have the cluster installed in the vehchile w/ PCM and other computers to communicate with the cluster?