I’ve written this guide for installing a Lamphus SoundAlert PA system, which should apply to almost any other vehicle. The vehicle I did this on was on a 2003 Toyota 4Runner. The more difficult parts of this install was getting wires through the engine firewall and figuring out which wires to tap off of for power and ground. I already knew where I could connect the ground and power wires to on my car, so if you don’t know where you can tap off for power and ground on your specific vehicle, you’ll need to do some further research. Much of the wiring that comes with the Lamphus SoundAlert PA kit looks intimidating, but half of it either gets taped off, or not used if you are planning to just use it for the alert functions and the PA system.