I just got a new cluster which say 80k miles, but my car has like 170k. I'm wanting to know how to roll the miles up. I was told it's pretty simple, but do I have to take apart something on the back of it?

This is off of a 92-95 Civic.

 

Where I'm from you go to jail for that

 

take it to a speedo shop and have it done and documented
I know how, but Im not going to share that information