No, the only thing that is connected at the #8 pin is the keyswitch to the injectors. Nothing else will be killed.
Also, if you decide on the relay, here's how to wire it. You can run a very light gauge of wire from the relay to your switch (and then ground). I also used a male and female disconnect to hook to the relay I used, so that I can pull it out and plug them back together if I take it back to the Toyota dealer.
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