Just rebuilt the entire braking system on my 66 Fast back. I installed a Wilwood M/C with a Proportioning valve, the valve comes with a brake pressure sensor. Instead of replacing the dreaded brake pedal switch I wired the brakes to the brake pressure sensor on the Proportioning valve. I am not real happy with the sensor because I like the brake lights to come on immediately and this sensor takes 60 psi before the sensor reacts. Thoughts on future problems because i bypassed the almost impossible to put on brake pedal switch?