In-dash tachometers

Not sure what this is about anymore?
67 was 1 year only, and I've yet to see differences from 68-9?
Do 2 oem tachs cover 67-9.
We arent the orig owners(3rd owner), but we have the orig fendertag and tach is on it.
I'm with you. The more I understand, the more I'm confused. What @NoCar340 said made sense to me, but my experience with cars has taught me that there are exceptions to every rule.