On W140 & R129 cars with analog instrunent clusters, the outside temp display is lighted by a bulb soldered to circuit board. NO replacement parts from MB anymore, but its fairly easy to remove & solder new bulb.

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MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar