Boost readings, maximums, and where from?

[SimonMitch]

Hope someone can help me, I've been modding a s12 for drifting, I've followed all the cheap stuff in the mod box, cut and welded rear springs, cut front springs, welded diff, mbc valve, saab intercooler, fatter exhaust, 2.5inch no centre box, but now I have fitted everything, I read that the stock turbo shouldn't be set above 12psi, I have 2 readings, one directly on the turbo outlet thats feeding the actuator via the mbc valve and one at the intake, I have a nice constant 10 psi on boost at the outlet of the turbo (foot planted, revs near the red line) that does a little 2 psi twitch when I drop off the gas and the stand ard guage goes maxed out once I get near 8 or 9 psi on the new guage. These readings are pretty consistant through the gears, although I did read somewhere that it varies through the gears (couldn't work out why this might be?).

Anyway are these readings about right or can I get away with tweeking it up a bit more without it blowing up?
Many thanks in advance

Cheers
Si