dont need one unless there are severe vibration issues from timing belt. He will know about it as soon as he tunes it.Also, he showed me how they do their own Crank Trigger kits which is combination of attaching a toothed gear in front of oil pump, trim the oil pump lining (the metal bit sticking out in front), attach an ATI harmonic balancer for clearance - that's the easy bit. The hard bit is finding room to attach the sensors i.e. if you have a/c in the car its less space.