That marker is designed for use with a low pressure tank, meaning 450 psi output. It can be made to work with an hp tank by removing or flipping a spring disc in the mini reg, but it's best to go with the lp input.
As for triggers, there is the violent products trigger, or cp has one to offer. When you look at cp's site, the G7 trigger will work on it. But make sure you get the one designed for a 45 frame, as they aren't interchangeable with the ones designed for a 90.
The evolve kit works nicely when properly set up, spekaing of which, an angel tool kit is a nice thing to pick up.
I had a Tadao board in my speed, and I still have one in my G7, love em both. (the ssc board is the one you'd need)
For parts and services, check out
www.angelforce.tv
Enjoy your new gun!