The Hydroooster is always used with the same pump that feeds the PS box.
However, a Hydrobooster can be used with the same pump and no PS box if desired.

This site has lots of great info on hydroboosters. http://www.hydratechbraking.com/ Check the Forums link for FAQ.
If Paul at Hydratech does not have an answer to your question, which is unlikely, he will find the answer. I recommend you deal with him for your first hydroboost project, as he will go the extra mile for his customers. You will not be disappointed with the service.

I bought a kit from him and installed it in my 52 that you see pictures of on my link.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-