xbox,
With respects I need to correct some of Your info.
Dielectric grease is not conductive, as such if a sensor connector is filled with same there is a good chance
sensor input, ground, or v/ref could be skewed. ( sensor circuits are 5v & usually <.005 ampere ).
As far as plug boot usage , all I ever used was dielectric , 20 plus years as dealership driveability tech
literally hundreds of plug and wire changes.
Perhaps the tube label your looking at is 'thermal grease' ?
Thx.