I am replacing the brake master cylinder and booster on my Turbo II. I already installed the booster on the firewall. The manual says to apply a 19.7inHg vacuum to the booster before measuring the pin. I assume the 19.7inHg is the vacuum the engine applies at idle right? So instead of buying a hand vacuum pump can I just connect the booster to the vacuum line and start the engine? Any help/suggestions appreciated.

 

you could try it, its probably close enough

 

usually these engines pull around 18"Hg at idle at sea level. the higher you are in the world, the less vacuum it will generate though.