Tommy,

It is a black box, bolted to the firewall. It has a red plunger switch. I think the box is roughly 2" wide, 4" tall, and about 1" thick. It has a plug that goes into the bottom with a grey and red wire, I think that is the color code.

Look behind the brake pedal and to the left a little.

I'm sure steve probably has a picture somewhere.

The switch is also called an "inertia switch".

It is inside the cab, sorry.