Galilean transformation of time

What does it say?
It says that good/correct/proper/well tuned clocks should
indicate t'=t.
Now, let's take another rule. We need clocks to be synchronized.
What does it mean?
It means that  that good/correct/proper/well tuned clocks should
indicate t'=t.
It is not another rule, it is the same rule.
And yes, you're idiots. All of you.