presumably it's an inductive proximity switch. if you have software to monitor I/O status of your engine electronics i would recommend carefully plugging the sensor back in - don't reinstall it, just leave it dangling, so you get electrical contact but try not to latch the plug, as you might exacerbate the problem trying to unplug it afterwards. if you move a large enough metal item (bolt?) in front of your sensor you should be able to see it change state in your software (presuming you have a suitable program to do so). if it still switches then there's nothing wrong with epoxy or maybe cyanoacrylate glue to hold it all together. however, i would suggest gluing it on the bench, nothing worse than accidentally gluing things into place.

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