Water level indicator

[leman_opc]

Richard, would appreciate your comment on one additional issue: sometimes when starting the car in the dark (i.e. lights turned on before the engine cranking) I get the gauge gleaming (brightness going up and down unsystematically). If I turn the lights off the gauge turns normal (steady bright), then turning the lights off results in gleaming once again. But turning the system off and on (with a button on a gauge) makes everything fine (i.e. steady dimmed light on the gauge with lights on).

The trimmer circuit is wired from my stereo dimming circuit, which is in turn based on a CAN-bus adapter. My dimmer trimming wheel on HFS-3 controller is turned almost all the way counter-clockwise. I note that the manual says to hook the dimmer wire to the headlamp and not the illumination circuits, may this be the reason? Is there any significant current in the dimmer circuit on HFS-3 so that it would make sense to rewire it to constant +12v via a relay triggered by ILL signal?

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EDIT: I stand corrected on above - gauge gleaming occurs when starting the car on cold (after it spent some time in the cold air and cooled down completely, +2 or +5 degrees C currently in Moscow), turning the HFS-3 on and off or turning lights on and off does not help. However, after some minutes the car gets warmer and the gleaming disappears - steady dimmed light with the lights on. The systems works otherwise perfectly. I will check if my battery is maybe low today but the car starts normally.