Circuit boards do fail. It can be replaced to fix faulty gauges.
Good working parts as shown. Oil pressure gauge has been REMOVED. PARTS ONLY.
1982 to 1985 W123 Turbo 300D Engine Instrument Parts - USED
$30.00
SKU:
ELT-L300DINSTRUPARTS 
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W123 Oil Pressure Gauge Actuator Replacement Instructions w/ Special Tool
Works on all 123 chassis 1977 to 1985 - common source of oil leak under dash
Oil leaks at the oil pressure gauge are becoming an increasing problem, particularly on the 1981 to 1985 turbo diesel models. You will discover it when you see wetness at the bottom lip of your instrument cluster or you find oil leaking on your feet or legs.
$198.00
W123 Oil Pressure Gauge Actuator with Free Instructions and Tool
LAST ONE. Fits all 123 chassis from 1977 to 1985 - a common source of oil leaks under the dash - with PDF download written and video instructions
ONLY ONE AVAILABLE. Oil leaks at the oil pressure gauge are becoming an increasing problem on the 123 chassis, particularly on the 1977 to 1985 diesel models. You will discover it when you see wetness at the bottom lip of your instrument cluster or you find oil leaking on your feet or legs!