Yes, the gray box/relay is beside the fuse box. Not sure about how to use your cruise for that. I finished mine a couple days ago with a toggle switch, then tucked it under the dash somewhere convenient to me, but not so obvious to anyone trying to steal my car! So when it's parked I just leave it "off", and also use it as my kill switch when driving, just flip it off, wait a sec then back on.
This is my first attempt to atach pics, so here it goes. . .
Here is a pic of the relay with harness unplugged, then the harness with the ground wire removed, then you see my wires running from the harness and from the ground wire which lead to the toggle switch (last photo):
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