emacs - show vertical scrollbar or indicator of position

I would like to show my position within a buffer on the left (or right) side of a buffer. For example, if my cursor is 75% of the way down a buffer, I would like to see an indicator 75% of the way down the left hand side of my window.

In a graphical editor, I usually see this as a vertical scroll bar.

However, I run emacs with --no-window-system, in my Mac terminal.

Things I've tried:

• M-x scroll-bar-mode: doesn't appear to do anything when I launch emacs with --no-window-system
• sml-modeline-mode: This is nice, but it shows the indicator in the modeline, whereas I want an indicator vertically, up and down the left-hand-side of my buffer.
• minimap-mode: displays more than what I want, I just want a vertical indicator of position.
• indicators.el: looks promising, but I haven't found something built on top of this that will indicate vertical position

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