When i got my B3, the only thing that showed my temp gauge [and warning light], was - nothing or full temp, both warning lights sometimes blinked without reason. I changed both temp sensors - one is for gauge, other is for warning light, in my case if one of them isn't connected, then gauge didn't display nothing. Gauge temp sensor was from junkyard [3 lvl, about 5 eur], warning light sensor was brend new original [12 lvl, about 20 eur]. It solved the problem.
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