Here's what I did:
I bought the Summit line lock, I couldn't figure out how to get the brake lines to seat properly, turns out, you need to use a separate fitting to make it so the brake lines will seal in the fitting... but anyway, I returned it and got the Hurst one, which turned out to be the EXACT same thing, the only differences being $40 and the Hurst one has a Chrome heat sink thing, and the Summit one is painted... so I got the Summit one again.
Anyway, I mounted it on the firewall, because it was by far, the easiest way to mount it, though I wish it wasn't as visible. For the wires, I ran them through the hole in the firewall that I had my boost gauge vacuum line running through. From there, I ran one wire up the A-pillar to my boost gauge pod, and the other wire to my fuse box (I think). For a switch, I went to AutoZone and the only switch that was lighted was a toggle switch. I wired it so that the light was on when the line lock was engaged. For the leads to the switch, I used the positive and negative lines that went to the boost gauge. To mount it, I drilled a hole the size of the switch, and had the toggle mounted on the top left of the boost gauge. It's easy to access, and the bright red light will be very noticeable if the line lock is ever accidentally engaged.