[joemathews]

RTV is a gasket sealer substance sold in tubes at your local autoparts store. I followed much the same process as the dude in that tutorial, with the piece of rubber hose coming off of the Tfitting, then the nylon line stuck in the end of the rubber hose.

I didn't use RTV, and have had no problems with the gauge line blowing out (just make sure it's a tight fit).