Our Hydraulic Brake Light Switch provides a pressure-activated switch closure to actuate brake lights. Has 1/8 NPT male threads for plumbing and two #10 screw terminals for wiring. Use our 3AN Brake Light Switch Tee (Part No. 3209-02-03S) to easily connect the brake light switch to a 3AN brake line. Switch closes at 60-120 psi. Maximum current rating 5 amps. If your brake lights draw more than 5 amps, you must use this switch to activate a brake light relay.