The 100C mark is Factory Test Indicator mark used in testing procedure of both gauge and sensor for specification accuracy.
The sensor/gauge test procedure is to sub. a 38 ohm resistance in place of the sensor. The gauge will then align with the 100C indicator marking.
What tolerance were your resistors? At 10%, your range could be anywhere between 36.9 and 45.1 ohms. (Stastically with 2, tolerance is cut in half to 5%). Best to use a Digital Multi Meter to measure the values. Don't forget to subtract probe resistance.
Otherwise, I recommend testing with 1% tolerance resistors:
38.3 = 37.9 ~ 38.7 ohms
10.0 + 28.0 series = 37.8 ~ 38.2 ohms
12.7 + 12.7 + 12.7 series = 38.0 ~ 38.2 ohms
Next project: improve fuel guage accuracy, and compensate for the bottom 5cm which the float cannot detect, and MB conveniently calls a "reserve" (beacuse their engineers can't figure out how to measure all the way to the bottom of the tank).
Bottom line is that it worked for you!
Thanks for sharing your test.
I don't really know what else to say about color bands on old composite carbon resistors. But with a larger gap, the "white" band is clearly the tolerance band.
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