RE: Fill column indicator functionality

[Drew Adams]

> I would like to have something simple like fill-column-indicator mode
> (but without it's conflicts and many issues) even if it only brings the
> most basic functionalities. This is a very basic code editing
> functionality that shouldn't depend of external packages (like line
> numbers for example) in my opinion.
> 
> It could be a line | or a background color change up to the X column.

Haven't been following this thread; sorry.

Have you looked at this Emacs Wiki page? Perhaps it will help - it mentions a 
few ways to indicate a particular column.

https://www.emacswiki.org/emacs/EightyColumnRule