How does one make one of these, what are the specs and what not?

We're having a very difficult time figuring out how to make one of these, so any and all advice is more than welcome.

It's for a '91 240.

 

Well You have 2 options.
1. Get a junkyard fuel rail out of a later model 4 cylinder they have a schrader valve setup that a universal guage will work on.

2. Go to the junk yard and cut part of the fuel line out of a junk car and part of the fuel rail and make a setup kind of like a t that will go inline between the fuel line and fuel rail then still has one part left to connect to a guage.

Make sure your fuel rail doesn't have the schrader setup already. It should be like between injector 1 and 2.

 

I'm still confused on how to make the tee from these parts. Does someone have a pic of this?

edit:
nervermind, I found the answer to my question here:
http://www.nuceng.ca/workspace/Volvo...cialTools.html