8.5 Hg" is about right for that pump. My FPZ runs about 8.5-9 Hg" full tilt.

Note that performance will be greatly affected on this system without the use of ultralight MDF. Your effective vacuum will be 8.5 - 6 = 2 Hg", which is not much. That is your usable vacuum.

I would close off the table ports and open up the '5th valve' to atmosphere (assuming you have 5 risers w/valves and only 4 ported to the table) and let the pump run. It will (or should!) register 0 Hg" free flowing. Check it to make sure it is cool.

-B