![]() 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. This is especially prevalent on engines with a chrome or stock timing chain cover that is actually bowing forward allowing the cam to "walk".I put a timing tape on my harmonic balancer and used a regular timing light to set the total timing at 35*. On Chevrolet engines, if the timing is retarding 10 - 20 degrees inspect for cam-walk. ![]() The correct polarity is whichever connection gives the most retarded timing. Reverse the connectors and check the timing again. It is best to route it along a ground plain such as the firewall, frame or engine block to form a shield around it.Ĭheck the polarity of the magnetic pickup wires of the distributor. It should be routed clear of the coil primary wires and plug wires. Inspect the routing of the Magnetic Pickup Harness. Make sure you are not using Solid Core wires. Try another non-adjustable light and check the timing again. Dial back timing lights are not recommended. What kind of timing light are you using? Many lights have trouble reading the MSD's capacitive discharge multiple sparks. If your timing seems to be jumping all over the place, check the following items: I guess I know what light to get now Thanks. Jeff Thanks here is the tech tip from MSD on lights.
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