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Hey mate. When buying gauges buy quality. The one you linked is more likely of the lesser quality. It's very important to get a good gauge that is accurate. Autron I think they are called seems to be the choice around here. I have a McNally but at $350 it's not cheap. VDO make good gauges too.
Where to plumb it up. Usually just tap into the intercooler pipe somewhere by welding a threaded bung in.