This is a small how-to that is designed to show you how to make a basic boost pressure tester.
1. Depending on what the size of your compressor inlet on your turbo is, you will need to get about a 2-3 inch section of silicon or rubber coupler hose. I was able to source a 3 inch diameter coupler at AutoZone picutred below. Notice that there is a black reducer ring in there so that one is enabled to connect to a 2.5 inch pipe as well. It comes with worm clamps as well.
Next, I went to Home Depot and souced a 3 inch knock-out cap from the plumbing/PVC section.
30 Cents. Ea.
The next thing to do is to drill a 5/16 inch whole in the 3 inch knock-out cap so that the valve stem below can go thru the whole. A multi-step drill bit is perfect for this, but not that cheap.
Since the knock-out cap isn't that thick, you may want to wrap a "few" turns of teflon tape around the base of the valve stem to get a better seal. (I couldn't source a deeper cap that fit)
The next thing I did was put the cap with the stem installed on one end of the coupler, and clamp it down tight enough so that it won't pop off:
For ease of use, I decided to install the tester on the 2.5 inch intake pipe, instead of directly on the 3 inch inlet of the GT-28RS. The black reducer ring that came with the coupler was key:
BE AWARE THAT IF YOU DO THIS, IT IS AT YOUR OWN RISK!!! I WILL NOT BE HELD LIABLE FOR ANY DAMAGES! DO NOT TURN ON YOUR CAR'S ENGINE WHILE DOING THIS!!!