[MrE]

Have you tried it yourself on a mobile tank? If so, please share some of your personal experiences.
I am thinking of giving it a try on my 1989 CAT 963 loader, which doesn't have a fuel gauge.  But I am concerned after drilling a hole in the tank and then finding out the reading is too jumpy to be readable.

I have not tried it myself. I am thinking about trying a couple of them on my holding tanks which I have no gauges for as well as my fuel tank. Pretty sure this would be a more elegant solution for the black tank than a sending unit with a float.