I'm about to swap out the expansion tank in my '84 XJ6, and I got a new grommet for the low coolant sensor. Of course, there were no instructions, so I'm not certain if I need to add sealant or anything when I install it. Anyone have any advice?

 

I got it installed just fine. To be safe, I used a little of the gray liquid gasket to seal it up. So far no leaks!