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Hooking it in with a fuse would be what I would perfer to do ,electrical fire dammage is not sumthing I want to think about. I will check the fuse box for a free plug in , or add a fuse in where I tap in.When I put my new edelbrock on a few weeks ago it said to hook it to a key on assesory postion. So far has been working like a charm. Hooked it into a place in my fuse box.
I do believe that is key on hot I`m basically running the choke and two solenoids for the vapor cannister on the same wire that is hot for the ignition module and uses very little power. As long as there is no power to it when the key is off. If you can find a grey/yellow wire that is key on hot for the heated oxygen sensor. I would start with a 5 amp fuse and put in the next size up up to 15 amp to rpotect the circuit in case of a short.