Just be sure to put a cheap computer-processor heatsink and fan on the backside of the ignition module, or it'll overheat and burn out. Computer fans are 12VDC...just connect it to the wire you run to Terminal B so it only runs when your ignition is on. The other wire from the fan goes to ground.
You can see in the Pirate4x4 picture that the guy used a piece of aluminum C-channel and a computer fan, that seems to work for him.
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I dunno what you're gonna use this Toyota for, daily driver or off-road, but instead of an on-off toggle switch you could used a keyed electrical switch.
If you wanna get really James Bond, go to Radio shack, get a digital keypad for a wired security system. They have two kinds...one that sends data and one that closes a relay. Get the relay one...it's a pretty small relay, though, so use it to close a bigger relay that gives power to terminal B, then no one can start your truck unless they know the 4-digit security code.
