2014 vw Touareg tdi lux. Was getting prices on brake pads and found out I should replace sensors on pads as well. how do I find out if I need the single or double terminal brake pad sensors. The vw dealership gave me both options didn’t say which one I need. Anyway to know without taking off tire and what not. and how many do you normally need for front and back. Thanks for whatever help I can get