zob, the vacuum switch is called a "mac valve". It's commonly used in air compressor setups.

Here's a good tutorial on building a DIY vacuum setup:

http://www.joewoodworker.com/veneering/EVS/concept.htm

Here's an example so you know what to look for:
http://www.veneersupplies.com/products/Mac-Valve-3-Way-14-NPT.html

I am doing my 5th, 6th and 7th board and modifying my 1st.
I was a couple of days from ordering this pump and all the tubes, conectors,... Now I realy do not know what to do. This pump and acc.s are quite expensive, on the other hand for a home made pump, there are things to learn/study and acc. to find/buy and put everything together. And so litle time to do it. This wouldn't be a problem for my father to put together, but he's only home at weekends and he doesen't have time for all my ideas.