fitting on 2nd gen S/C boost port

Looking for advice before I head out to the auto parts store. I've got a 1st gen TRD boost gauge to install on my 2nd gen S/C. Looks like I need the rubber fitting noted in the pic below. I've got several fittings that came with the gauge, but they are all metal and threaded. I've searched here and XRunner Underground and only found the pic below of what I need.

Sorry, I'm not too mechanical, just want to know what to ask for so I look somewhat educated. Any advice appreciated.

 

I have a different gauge. I replaced the hose.This is not a great pic. My gauge has a sensor that I mounted to the firewall. Then there are wires that go to the gauge.

 

It is a vacuum hose adapter.

If you cannot find one like in the picture, take your hard plastic hose with you and try to find a vacuum hose that fits tightly around the hard plastic hose. That will work as well.