OK I have my gauge installed but when I went to put the nylon
1/8 hose from my autometer gauge into my 1/4 1/4 1/8 T fitting the nylon tube won't fit on. What other fittings do I need to attach the tube to the T fitting thanks in advance

 

you need to get an 1.5" length of 1/8" - inner diameter - vacuum hose. The hose will be the two "female" end that will accommodate the two "male" end of the boost gauge hose and the T fitting.