The ECT(engine coolant temp) sensor has been the same for almost 30 years!!
Almost all cars use this sensor until the late 90's, even the same color wire- GREEN.
The values are:
110ohm = 60C
67ohm = 80C
38ohm = 100C
BY these figures the gauge is incorrect!!
The sending unit is telling the gauge to read around 86C the way I figure it.
Possibly could add a 10 ohm resistor to the circuit.
MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)