Sparked by your question, I dug around over thanksgiving, pouring over the service manual and tractor. Although there are numerous indicators on the dash, according to the service manual, only the 4WD, Diff lock, parking brake, high beams, oil pressure, alternator, and glow plugs have lights. On mine, all those work except the 4WD and diff lock. I found a plug on the 4WD, but nothing for the diff lock. Nothing in the manual about the actual switches.
On another note, contrary to the owners manual, there are no PTO, Neutral, or operator presence safety switches, at least according to the service manual. The only switch that feeds into the display unit for the start circuit to be complete is the clutch switch. From the factory, the CK has no other safety systems. I had found this to be true for my CK, but assumed that it was a dealer thing. At least one company relies on common sense.