Brake Pressure Switch ?? Need A replacement

Most likely the new switch with 2 posts is just a SPST switch. If you were to ground one post and hook the other to the stock wire you would be good to go.

Just reread you post, are you sure the willwood switch is to activate the brake lights?

The idiot light switch in the OEM distribution block works with a piston inside the block that when the pressure on one side is reduced, causes the piston to move to one side making a path to ground to light the idiot light up.