I'm a charter member too. To burn coal in your home and not have adequate CO protection is just not too smart. For that matter if you burn wood, gas, oil or have an attached garage, you should have co detectors. I've got hardwired with battery backup smoke detectors on every level and in each bedroom per current code here. My house is 60 years old but if you get a building permit for anything on your home, they make you upgrade. The basement and second level units are also CO detectors. Then I have stand alone CO detectors also in the basement and first levels.
Don't want to wake up dead you know.
No, my manometer is not installed sideways. Damn Iphone pictures!