I figured, if Innova’s own tech services people said their light would be damaged and will give inaccurate readings, that they know the most about their own product.I don't disagree at all. Their light is pricey and even their tech said that unless I’m racing it is over kill. They said any inductive timing light will work with their MSD ignition systems, but the most accurate is their own MSD timing light. You can call MSD (Holley) and talk with their tech services, like I did. although I have to say that until I see it for myself, I won't believe that the analog timing light won't also suffer from the same issue (that is, I expect that at idle RPMs, the light will flash once for each spark signal meaning I'll see 3 timing readings in the same cycle where one is the first spark signal, one is the second spark signal, and one is the third spark signal). That's why I guess that I'm going to go back to a normal old analog timing light. But, that's a pretty limited use of an otherwise high-tech timing light. Yes, I understand the gun would flash accurately over 3000 RPMs since the MSD unit is only providing a single spark per cycle at that RPM or higher - and the dial-back feature might also work at those high RPMs, too. If that Innova 3568 was deriving RPMs based on spark signals, I'd think that the RPM reading would be 3 times higher on the Innova than actual RPM when the engine is idling at around 850RPM since the MSD box is kicking out 3 bursts (sparks) per cycle whereas a normal ignition system would only be kicking out a single burst. The tach feature on the digital Innova 3568 (which I just returned to Amazon) was showing the same RPMs as the car's gear-driven tach and that's the mystery that puzzles me - purely out of curiosity and nothing more. Do you have a picture of yours? The tach in my C3 is fed by a gear-driven cable off of the distributor shaft so it's not using any electronic signal from the MSD box. Resdoggie - I can't seem to find an "Innova 3368" on the internet. The Sears Craftsman was referred by many on the forum and the tech from Innova. I just purchased a vintage Sears Craftsman timing light on E-Bay which works awesome. They said it will give false reading and you "would" damage the dial back timing light. I called Innova and their tech services people told me that their light will not function properly on any multi spark ignition systems. The question I REALLY have, though, is how the heck can the tachometer display on this timing light be accurate with all the multi-spark features of the MSD ? I find the two facts - tach very accurate but timing advance/retard inoperable/ineffective - to be baffling.I posted a thread here on the forum a couple months ago regarding this very issue. I will attest to that with my experience here despite several of you stating above that yours works fine. I’ve got an MSD 6A ignition and all the threads I see (and other research I did, too) say that this ignition box is not compatible with dial back timing lights. However, advancing/retarding the timing with the up/down arrows on the timing light does nothing with regard to moving the timing mark. I just got my awesome new Innova 3568 dial back timing light. The question I REALLY have, though, is how the heck can the tachometer display on this timing light be accurate with all the multi-spark features of the MSD ? I find the two facts - tach very accurate but timing advance/retard inoperable/ineffective - to be baffling. I didn't see any difference from my dial back timing light although I had to "read" through all the flutter.I just got my awesome new Innova 3568 dial back timing light. I put a timing tape on my harmonic balancer and used a regular timing light to set the total timing at 35*.
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