If you want to experiment, I've found the 2 components to be critical:

Digital Tire Pressure Gauge. Fabulous quality and joy to hold and to use. This reads to .1 psi could be re-calibrated if necessary. A digital gauge to me is much more helpful than an analog gauge. For one, it is vastly easier to read.
http://www.longacreracing.com/catalog/item.asp?id=982&catid=8

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Air compressor. Could be found at a very cheap price ($150 or so I think) at places like Home Depot. Very convenient and an absolute, absolute must if you're the OCD type Smiley.

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Regards,
Can
997 Turbo + Bilstein Damptronic (Review) + Cargraphic Exhaust (Heavenly Race Car Noise Smiley Review)