Installed a new air dog and vp44 and decided to put a fuel pressure guage in my truck is it normal for fuel pressure to drop going up a hill.

Sure because your engine is working harder. The thing just needs to stay high enough to not starve your IP

What are your pressure readings, idle, going down the road and wot. 

Minimum is 14, normal 16,18 and for the most part want to stay 20,21 max. 

Also good idea to put a snober and a needle valve before the gauge, or it will fail prematurely.