There is a sensor that screws onto the thermostat housing.

There are 2 nipples on this sensor, both for connecting vacuum lines. One vacuum line comes from the back box on the valve cover. The other vacumm line goes to the EGR valve.

I replaced the sensor and need to ascertain which nipple connects to which side.

Looking at the sensor, it says CARB on one side.

Any help would be appreciated.