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Great info!
I know fuel pressure gauges are all over too.

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Why are we paying so much for these guages when their accuracy is questionable

So if you find your tach is lets just say 300 RPM off..... what can you do about it? Is there a internal adjustment you can make

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I think the main message is to not take the instrument readings as the absolute truth, some gauges are not ACCURATE I've seen a bunch of supposedily high quality aftermarket mechanical temp. gauges be off 40 degrees, reading 140 F when the actual water temps are right at 100 F according to a certified claibrated thermometer All instruments are a measuring device to provide us information, accurate information When in doubt, check it out I learned on that first electric tach to move the lever when the motor quit pulling,no matter what the tach read, not to keep it in gear with the right fooot down waiting for the tach to read 7000 RPM