I am trying to get all the lights working in my diesel.

Seems everything is fed light through the fiber optic system.

Questions:

1. Where is the central hub? Do I need to pull the ACC unit to access?

2. Does the light (circled) belong in hole "2"?

3. How do I get the temp wheel lit up. It did on my previous '80 car with type one ACC.

--The light for "3" is right behind the hole, just needs to be pushed foward (towards front). There is a light already in hole 1, so hole 3 is the only hole without a bulb present.

Any tips are greatly appreciated.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E