Thanks Mr. B., that helps to confirm what I've been guessing. I had not noticed until a few days ago that there were two outlest, one large and one small, from the pump.

I am planning on routing the large outlet to the booster, using most of the molded rubber line that the gas engine used, as well as adding some of my own to make up for the extra length needed. The small outlet will run to a tee, which will feed the HVAC box from one side and the vac. switching valve from the gas engine (one of them, anyway - I'll have to see which is most appropriate. I think I just need one that does on/off from the AC signal) to operate the high idle solenoid, which is only used for the AC as far as I can tell. At least that's all I plan on using it for, as I have no other triggers for it.

The rest of the vac. system used on the EGR and quick warm-up hardware will have to remain disconnected, at least until I can get my hands on the controller boxes, switches and valves needed to run them.