brake pedal switch?

My car has a Ron Francis pressure switch to activate the brake lights. Even though it's a low pressure switch, it doesn't activate until there's significant brake pressure. Anxious to avoid a rear end collision, I'd like to wire in a stock switch at a the brake pedal.

Can anyone show me a photo or diagram of where to install one one and how it operates? I've Googled around and found not one thing.

Thanks,
Marcus