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...truly "mechanical" contact is NOT a good idea because "friction & wear" will doom it to failure, sooner or later.
...magnetic or inductive "sensing" is the preferred method. However, the problem with magnetic is that eventually you end up collecting a "ball" or iron filings and dust. The inductive method is what most automotive applications use.
..."optical" sensing works, but engine oil vapors eventually stop them from working reliably
Last edited by gone-ot; 06-12-2010 at 08:15 PM..
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