Gauge Install Q?

So I was thinking about buyin some new gauges to accompany the new S/C...but was wondering what level of difficulty gauge installs are. I was going to go with the A-pillar, w/ boost, A/F, and Oil temp. I'm not as worried about the electric stuff as much as the possibility of drilling into my interior, or ripping apart my dash...any comments?
 
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For mechanical boost gauge you have to drill a small hole (3/8" i believe) in the firewall for the tubing. I put mine right above the gas pedal opening, put in the supplied gromet from Autometer, then filled it with silicone. Also I just punched the opening up to near 3/8", then drilled it through to the interior (from the engine bay) going through the thin insulation layer and plastic.