Get thee to a *REAL* auto parts store (NAPA, Farm Supply, Joe's Auto
Parts. Not Kragen, Chief, AutoZone, Schucks.) and buy yourself a
pressure guage.  Welding supply will also have them.  0-100 psi is what
you need.  Just not that uncommon.  You will also need a 1/4" hose barb
to fit said guage and a few feet of 1/4" FI rated fuel hose. Add a
couple small worm drive hose clamps and you have your tester.  Total
cost? About $20.  A must for troubleshooting Bosch FI.

Jim Arnott
WetWesties
Union, OR