I've never used an adjustable timing light. But if you're truly @tdc on cylinder 1 and the mark on the damper is showing the same thing, set the timing light to zero. That should confirm your rotor is truly oriented correctly. 65'
and if all is correct, then its a matter of setting the advance on the light and watching the mark on the crank hub and setting the dis to the 0 on the timing tab correct?
