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It means you only need use the TDC mark when setting the timing, you dial the advance in on the timing light so you don't need to work out what other marks are on the balancer or timing tab on the engine. Also very useful when you're looking at total advance at higher revs, you just flash the light at the pointer, bring up the revs and use the dial to keep the tdc pointer aligned then read the advance off the light. Probably more useful on older stuff where you play around with a distributor but they are still a handy item to check. A lot of engines timing marks only read to 10 or 15 degrees so past that you can't see what's going on without one.

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https://www.sau.com.au/forums/topic/287705-timing-lights/#findComment-4822856
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