Pennsylvania estimated tax

In Pennsylvania, what is the estimated tax based on? Is it like federal in that you can pay based on last year's tax paid? Last year I moved to PA in November and paid $2 in tax. Or do I have to figure out the new year's income for estimating tax?  

 

I find no real clarity of PA's safe harbor for estimated taxes. There is something about living a full year in PA last year, and it may be that moving mid-year means you cannot use the safe harbor.