Rethreaded gauge connection
I have an Autometer mechanical gauge which I took and rethreaded the fitting on the back to convert it from -4AN to 1/8" NPT. Then I used the standard nylon hose like is used for the boost gauge as my line, that was the only way I could route it to my dash pod (braided SS too thick and stiff!!).
So far no leaks, works great, no pulsations/vibes. When routing it I covered the line with rubber hose wherever it came in touch with something and ziptied it in place to make sure it wouldn't wear through.
Cheap setup, works great. One downside: my gauge only goes to 15psi.
Vaughn