I just found that the input power requirements for GM OBD II: 5 VDC 5 mA typical. I've just been hunting power supplies and have found only one credible website, so far: www.powersupplydirect.com.
I am interested in other sources, but I wanted to get this information out there.
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WizAire CAI w/9" K&N & HV3, 2.5" d/p w/h/f cat, Cobra CB, PowerSlot slots w/Hawk HPS, GR-2s, GMPP handling kit, NextLevel STBs, Pilot Sport A/S Plus tires.