The cluster is out, you won't believe what I found

As an example, a photo I found "on the net"



Look at the area circled. You can see the trace goes only from the left hand connector pin to that stud. You'll have to turn the panel over to see which gauge, but this pin can only be one thing..............a gauge sender connection

Then all you have to do is get out the service manual and justify the physical to the wiring