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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