67-72 factory tach calibration? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SERE · 10-25-2004, 03:32 AM

Does anyone have any experience with calibrating a factory tach? I have two of them and they work fine, but there is a ,sort of dial looking thing, on the back and I can't find anything in the manuals about it. I just want them to be indicating the correct RPM. Also, the one tach I have in my 69 with a 454 and it stops at 3200 RPM. The needle just stops like it is hitting a stopper? Any in formation on these tachs I would appreciate the help.

68 GMC 1500 4X4 short fleetside, daily driver on my 12 year resto!
69 GMC 2500 4X4 long stepside, project

10-25-2004, 03:32 AM	#1
SERE "AIRBORNE" Join Date: Oct 2004 Location: Spokane WA Posts: 60	67-72 factory tach calibration? Does anyone have any experience with calibrating a factory tach? I have two of them and they work fine, but there is a ,sort of dial looking thing, on the back and I can't find anything in the manuals about it. I just want them to be indicating the correct RPM. Also, the one tach I have in my 69 with a 454 and it stops at 3200 RPM. The needle just stops like it is hitting a stopper? Any in formation on these tachs I would appreciate the help. 68 GMC 1500 4X4 short fleetside, daily driver on my 12 year resto! 69 GMC 2500 4X4 long stepside, project



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