Genuine German-manufactured VDO Instrument Cluster Dash Light Dimmer Rheostat (Potentiometer) for classic Mercedes-Benz W123, W126, and R107 models. Mounted on the back of the instrument cluster, this ceramic-bodied variable resistor regulates the voltage supplied to the gauge cluster and center console illumination bulbs when the trip odometer reset/dimmer knob is rotated.

Condition: Working. Pulled from a functional instrument cluster or verified via ohmmeter sweep bench-testing. Features a straight metal actuator shaft, intact white ceramic housing with no cracks or chips, clean brass terminal contact strips, and smooth rotary resistance travel with normal age-related surface wear.

🚗 Vehicle Compatibility:

• 1977–1985 Mercedes-Benz 230 / 240D / 280E / 280CE / 300D / 300CD / 300TD (W123 / C123 / S123 Chassis)

• 1981–1985 Mercedes-Benz 300SD / 380SE / 380SEL / 380SEC / 500SEL / 500SEC (Early W126 / C126 Chassis - verify shaft style)

• 1972–1989 Mercedes-Benz 280SL / 350SL / 380SL / 450SL / 450SLC / 560SL (R107 / C107 Chassis - verify rear cluster housing match)

(Note: Stamped "9010" on the ceramic face, matching VDO / Mercedes-Benz 000 542 36 25. Late W126 and W124 clusters use a similar-looking rheostat with a different shaft length/end—please compare the rear terminal layout and shaft style to your existing unit prior to purchase.)

⚠️ Common Problems:

• Complete loss of instrument cluster and center console switch backlighting while fuses remain intact

• Flickering, intermittent, or dead spots in gauge brightness when turning the dimmer knob due to oxidized internal resistance wire windings

• Cracked ceramic base or broken brass contact tabs caused by over-tightening or heat cycling

🔧 The Part Fix:

• Replaces a burned-out or corroded factory rheostat on the rear of the speedometer housing, restoring full, flicker-free dimming control to all dashboard and console illumination bulbs.

• Prep-Work Warning: Disconnect the negative battery cable before pulling the instrument cluster to prevent accidental short circuits against the metal dash frame. Clean the mating contact pads on the instrument cluster circuit board with electronic contact cleaner before tightening the mounting screws.

🔢 Part & Manufacturer Identification:

• Primary Mercedes-Benz OE Part Number: 000 542 36 25 (A0005423625 / 000 542 36 25 64)

• Related / Visual Variant Mercedes Numbers: 000 542 35 25, 000 542 38 25

• VDO Manufacturer Housing Stamps: "9010"