Quote:
Originally Posted by aetherz
Does this component somehow sense the level of water in the tank (with just resistors in some putty stuff)?
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Yes: Each end connects to tank "probes" (just bolts through the side of the tank). When the liquid level reaches the bolt it effectively shorts that bolt to the bottom one (which is usually ground). Each probe has a different resistance value and the meter can measure the amount of fluid in the tank based on the total resistance of the harness. (Simplified explanation, a more detailed one is a few pages back in this thread.)