My RX-7 has an oil level sensor, but I've never had it out to see what
makes it tick. But it only reports when the oil level is low, not
multiple levels.

I've used these sensors for water level, don't know what the upper
temperature limit for them is. They use a magnet and a reed switch:
http://www.ebay.com/itm/-/311231357646

Cheers, Bob

On Tue, Feb 17, 2015, at 09:39 AM, Neil wrote:
> I looking into making an oil-level sensor as a general indicator of oil=20
> level.  It does not need to be super accurate, and really just needs to=20
> indicate a minimum of 5 levels -- too low, low-side of normal, average=20
> normal, high normal, or too full.  Space for the sensor is tight --=20
> approx 1" dia and about 6" to 8" deep.  I've found this page, which=20
> shows some general ways this is done...=20
> http://www.machinerylubrication.com/Read/23921/oil-level-sensors-automoti=
ve-industrial
>=20
> What I'm thinking is a small donut-shaped float around a 6" tube, with=20
> magnets in the donut and reed or hall-effect sensors in the tube.  Or=20
> vice versa -- a tube with the sensors in the tube wall, and a magnetic=20
> ball floating in the center.  Any better (simpler) ideas?  Or anyone=20
> know if I can do this with some type of capacitive sensing?

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