why would i need a green vacuum if i have a manual transmission (what is that doing? Is it for cruise control maybe?)

what does vent mean.. the black one (vents to cabin? not sure what that means /does... it holds no vacuum though).

yea the brown one (both on the right and on the left that goes into the shutoff valve holds vacuum very well).


But like you said... that yellow nipple thing in the middle... holds very little vacuum. At 5psi it will hold but never go beyond that.


Thanks for any input!