I'm still looking into this, and it looks like a few people ahve used a floppy drive power cable to connect it up...
Found this writeup...
DIY: S2000 Push Start Install - Team Integra
now I just need to figure out which wires get tapped for the ignition...
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2008 MegaCab 6.7L Silver 4x4 SXT; Banks CAI; RSD 5" TBE; XRT; Shibby Boost Tube and GHD; BOD Intake; AutoMeter Boost/Pyro/Trans; EPP; AmpResearch PowerSteps; 20" Moto Metal 956's; MT Baja MTZ 35x12.50;