The only way I can think of would be to find where the wires are plugged in, de-pin the connector there, and find a way to "piggyback" another wire or another connector onto the connection.
This is a lot easier with the power and ground wires (and illumination if any) than with the two "data" wires, VSS and injector signal. I don't actually know what the connectors for the EFI parts look like on the Hondas, so I can't say anything about them for certain.
It would certainly be much simpler to use "vampire taps" to get those two signals. But it doesn't seem like a "clean" install (I don't like those taps!) which is one reason I never installed mine.
-soD
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