Here is the parts list I used:

1-       1/8" npt tank valve (could use a valve stem from a car or bike
and rig it up somehow with clamps and hose with a barbed hose connector
but what I did was easier) (found at Prices Auto in Canada)

1-       1/8" npt threaded filter gauge (that is the pressure gauge.
Mine is 30 psi and the threads are on the back.  Don't know what filter
gauge means, but I found it in the compressor section of an autoparts
store (Prices Auto in Canada)

1-       1/8" npt brass barbed hose connector (found at a hydraulics
hose store, but common at other stores)

1-       1/8" npt brass "T" fitting to attach everything together (found
at a hydraulics hose store, but common at other stores)

1- old coolant pressure cap with guts removed or broken off so that it
allows a free flow of air in and out

1-       Short piece of high pressure fuel line

2-       Hose clamps

1-  Bicycle pump to pressurize the system

- Thread sealant to make sure the threads are sealed

Basically everything ties into the brass "T" fitting.  Easy to figure
out once you have the parts.   Then screw the old cap on the coolant
pressure tank(coolant will likely form out of the pressure tank...it did
on mine), hook the tester up to the cap with the short fuel hose, clamp
it on and pump the system up to 15PSI with the bicycle pump.

I have pics if anyone wants to see my setup.  Just p-mail me.

Pascal 

'84 Westy
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  Another cheapy huh..
  Please tell more about the details of planing/building your pressure
tester.
  Nate