I have a Alpine PDX 4.150 that I want to run my mids and highs with. I currently have 4 Alpine R 5x7's and would like to add an additional set of 1in dome tweeters on the pillars.

How would I go about wiring that up?

Thanks

You shouldn't. In particular without citing the goals you hope to achieve.

A couple problems: multiple tweeters in a front stage are bad and you should run every driver on its own amplifier channel unless you are truly capable of building a custom passive xover. If you aren't willing to do either it really won't sound all that good. If you have to you can probably just parallel them with a 5x7, but you are going to need some sort of Lpad to adjust the level of them and a crossover to keep them from blowing.

Well with the full range coming from down on the doors I just wanted alittle more up top. Would the crossovers that come with them not be enough? Worst case I guess I could sell them and buy components ......

Components could definely be a good start to bring the sound stage up. They would allow you to play with tweeter placement to achieve better imaging.