I'd like to set up a vacuum clamping system, mainly for router templates. I searched SMC and found a few answers, but have one specific question I couldn't find.

If I have a tank (I think it's 5 or 6 gallons), how big should the vacuum pump be? I don't want to use a venturi system with my compressor, and have seen A/C vacuum pumps that don't cost much money. I was wondering if they would work.

Thanks in advance for all the help I know I'm going to get.