I'm not sure I never looked into the electrical package, as for the dash in your unimog I have not a clue what the light is for. At idle and at operating temperature my 617s run 1.5-1.7bar.

__________________
Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k