vaccum wiper hook up

[0351mike]

I have a 68 half cab with vaccum wipers. The vaccum pump has an in and out port. I am assuming the out goes up thru the windsheild frame T's and goes to each wiper motor. What goes to the in port on the vaccum pump?

[dodmort]

when you say vac. pump you mean the combination fuel/vac pump....right?
they are different size tubes on top of the pump.
one goes to manifold vac and the other to wiper motors.
my 68 has the larger tube going to wiper motors.