As far as the fuel pressure tester, the hose does not thread into the test
"T", it fits over it.  For short tests, a piece of 1/4 inch high pressure
fuel hose can simply friction fit over the "T".  Most of the inexpensive
gauges (I used an oil pressure gauge) use 1/8 inch NPT fittings.  Hose
barbs are available in this thread also.  Most any good hardware store or
auto parts store should carry these items.  Good luck.
Steve Sandlin
84 Wolfsburg Westy
79 transporter
00 New Beetle