Tuning

[4WayDiablo]

to the left CV boot?

No no no. You have it all wrong. Its by the thermostat housing

Are you sure? seems like an odd place to put it as you need to wire it in the rear light loom?

Yeah I know man but if you run the wire into the cab then up the a pillar, along the roof. Down the b pillar to attach it to the handbrake. From there you run it under the rear seats (which you have just folded down adding 10bhp^^^)
To the rear light cluster whilst your at the handbrake though don't forget to T into it. That's obvious where that wire goes though...