Glad to hear you took the plunge. It generally take a few tries over a few days to get it just right. Look for a faint wisp of dark smoke in the rearview during full acceleration under full load in full sunlight.
I can't site the source to you as I lost all my links and saved articles during an OS upgrade error, but I'm very sure after extended research that 15 psi was the safe limit. The over boost protection solinoid opens at 1.1 bar which converts to 16psi.
Getting the spring in and out to adjust the boost is a buggar but well worth the effort.
[Edited by h2odiesel on 06-23-2001 at 08:51 AM]