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You need to use a basic inductive timing light if you're going to use a spark plug wire to measure timing on and sr20.
Dial back lights might give you a false reading. They are designed to be used with the coilpack harness grounding loop.
I've measured signal from three different positions: grounding loop, #1 coil pack lead, and using a spark plug wire and gotten different timing readings each time with the car locked in timing mode.
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