If you are going to be ordering a custom sensor then you definitely want to make sure that you Go with the quote that has the best price but that also has good service and guarantees their sensors. Find out more here http://www.positek.com/submersible-linear-sensors.
Working with a manufacturer that offers after sales services is a good idea because you never know what might happen after you buy the sensor and if you need service, it could be hard to find if you don't have after sales service from the original manufacturer.
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As for location, it is ill-advised to have your oil tank buried, especially because of Not only is this a safety issue, it is also a major environmental concern. So even though you'll save some space, buried oil tanks are not the way to go. This is also considering the fact that it would be easier to forget something that isn't constantly visible, which would mean that any leak would be that much harder to pinpoint.