Jason; I get that I could do it with the car still. But, my experience is that factory tachs that are accurate at one rpm (say at idle) are rarely accurate at cruise. I figured the best compromise was to pick a cruising speed (my speedo is accurate within 1 mph all the way from 45 to 70), calculate the correct rpm at that cruising speed, and dial the tach in there.
Sounds like a lot of trouble, but it will just be one drive. Besides, the only other "known good tach" I have is an old Sun tach that is hooked up on my Studebaker farm truck, so I would have to remove and then re-install that one. I have a cool old Moroso (Jones) cable drive tach, but the distributor on my Z doesn't have a cable drive.
Dave; I don't remember anything being written on it. Will look when I get it back off.
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04-10-2020, 03:36 PM
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