Are you using a digital manometer/pressure tester?
I still use a basic YJ 78060 pressure test kit. It works fine for setting/testing pilot and main hi/low pressure for LP and natural gas systems. Is anything else really necessary?
Looks like you could use one just to keep the YJ honest.
I take two readings. One analog and one digital especially on two stage furnaces. I like my YJ analog but I have had a long time and am just waiting for the day it does not read the same as the digital.
I set up a lot of Aaon units, so I put a UEI manometer on the line before the valve and use a second one on the valve discharge. They are very critical on what the factory wants. I find the UEIs are very easy to use and pretty durable.
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