Hey mate, I run a Garrett GTX2863r which ran really nicely on an 11mm pump. I have a 12mm pump now and the turbo is my limiting factor, I could put a Borgwarner on and make a lot more power and torque.
Honestly I would recommend the Borgwarner that AB has on his GQ. There are no other turbo out that I have seen work ad efficiently on a TD42.
The BW also gave some very impressive results on a 10mm pump so I would imagine the same on your 11mm pump.
As for intercooler, I have a cross country top mount. If I had my time again I would save the money and make a front mount cooler, they do work better at the front. Don't get me wrong, the cross country is a great bit of gear, and comes with everything you need but it was very expensive and isn't as efficient as a front mount.
I use autometer gauges, they were on the car when I bought it but they are a good quality gauge.