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Those appear to be discrete sensors. Meaning they are either off or ON. A
very important concept in reducing risk is to use analog sensors whenever
possible. Your understanding of your fluid level is better with analog
sensors. Less apt to discount the readings, you can see the gradual change in
fluid level.
You want as many factors in your favor as possible.
Anyone
looking for good liquid level sensors might like the eBay offering for
these:

GEM
ELS-900 Miniature Liquid Level Sensor
Ends
Feb-04-06 07:59:51 PST
Currently
$10 for five. They run about $50
each if new.
Here’s
the link to the eBay sale:
There’s
a second sale from a different vendor for one sensor
at
Happy
sensing, Chris Sargent
-al wick Artificial intelligence in
cockpit, Cozy IV powered by stock Subaru 2.5 N9032U 200+ hours on
engine/airframe from Portland, Oregon Prop construct, Subaru install, Risk
assessment, Glass panel design
info: http://www.maddyhome.com/canardpages/pages/alwick/index.html
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