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There was a post a couple of days ago asking for help in finding an ignition key controlled wire for the Meziere power supply. I'm not sure what happened to the topic, but I have the same question.
I will have my full writeup up tonight hopefully showing how to wire it up.
FWIW, I wired mine to only come on when the engine is actually running. This way you can LS1edit/tune/whatever without killing the battery or having to disconnect the pump itself. An override switch can be fit to the way I have it wired up to allow manual overriding if you want to cool it in the pits at the drag strip.