Waste Gate Tube to IP
 

I'm a little late asking this because I have been driving the truck for about 5 months this way. I put a Schwitzer 3LM299 on my truck last fall and it doesn't have a wastegate. I just plugged the tube that went from the IP to the old Holset WH1C. Should I have done anything else with the tube. I'm not really sure what it does.

That tube feeds back the pressure the turbo creates to the wastegate actuator, so if no wastegate you are fine. Closer to the manifold I think it tee's off to the AFC housing, to limit fueling under low boost, so make sure it's plugged tight.