I'm thinking a test light is a test light is a test light. However, I don't know everything so in this case maybe it needs to be an LED testlight. The VR won't catch when I crank it so I'm trouble shooting with my trusty bentley. I just finished testing for "ground signal" on the harness for the coilpack. The Bentley calls for using an LED testlight. I only have a bulb powered one and the light doesn't come on when it should , is that because its not an LED ?