I messed up the inductive sensor on my old Sears timing light. The sensor is made of plastic and it got to close to the exhaust. It still seems to work, but I'm not trusting it anymore. Might as well upgrade to an adjustable advance model such as the Innova 3468 or the Actron cp7528. For adjustment, the Innova has a digital screen with buttons and the Actron has a simple knob. I suppose the Innova is better since the digital screen has a tach.