How to disable font anti-aliasing properly?

I am not using ClearType and I need to disable font anti-aliasing on RRD graphs.
I understand that I need to use a font specifically designed for aliasing. Let's say Tahoma.

So I'm using these options:

--font-render-mode mono
--font DEFAULT:0:Tahoma

It disables anti-aliasing and changes the font.
But the font looking is "ugly" like any anti-aliased font: https://imgur.com/a/VXiVC

I am not familiar with font rendering. I guess there is a problem with hinting or something.

It seems possible as there are examples over Internet.
http://arma.biz/blog/tools/munin-custom-fonts/
I am trying to achieve font looking like on the bottom picture.

I am using RRDtool 1.7.0 on FreeBSD 11.1


What am I doing wrong?