Sleep on it, they say, and the answer will come. Now I'm not a mechanic, this only comes from thinking about the physics of the problem - please someone who knows what they're talking about put me right if this isn't the case. Now I know this is modding 101, but please bear with me because this is my first foray into proper mods.
The FMIC and all that extra piping has (for argument's sake only) doubled the volume that needs to be filled with air before the intake plenum. This means that it takes twice as much air to reach the same pressure as it once did and the turbo has to work twice as hard to get there. There's probably nothing wrong with my gauge, tee or anything else, I'm simply getting to the limit of what my little snail can puff.
Is this the case? And if so, if it was considered "safe" to run my virtually stock skyline at 12psi, I'm assuming I've got to wind this figure down somewhat for the modded one?