Vacuum Assist Brakes
Firstly, you need to have a check valve between the engine and the resivoir, since you're never reading above 12" clearly there's a low vacuum issue .
The gauge also needs to be on the booster side of the check valve .
Shouldn't need to add a vacuum pump once everything is properly plumbed up .
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-Nate
Geezer
'49 3100 235 W/ Muncie SM420 SOLD
'69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH 
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