6 cyl tac or V8 tac question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

seetheusa · 02-26-2012, 04:41 PM

ok at second look that could be a vac and on my tach the yellow to red colors for over rev are painted on the face of tach.as far as the cable drive on mine could be how they did it in 67.goodluck

**70shortfleet** · 02-26-2012, 05:34 PM

The cable driven tachs for these truck are for diesel engine trucks and lens only go to 4000 rpms

**too much stuff** · 02-26-2012, 06:02 PM

Quote:

Originally Posted by 70shortfleet

The cable driven tachs for these truck are for diesel engine trucks and lens only go to 4000 rpms

This is correct. From the front, you can not tell a 6cyl from an 8. Actually, if the numbers are gone on back, you can't tell that way either by looking.

02-26-2012, 04:41 PM	#1
seetheusa Registered User Join Date: Mar 2008 Location: indianapolis indiana Posts: 3	Re: 6 cyl tac or V8 tac question ok at second look that could be a vac and on my tach the yellow to red colors for over rev are painted on the face of tach.as far as the cable drive on mine could be how they did it in 67.goodluck

02-26-2012, 05:34 PM	#2
70shortfleet Senior Member Join Date: Apr 2010 Location: St.Peters, MO Posts: 2,255	Re: 6 cyl tac or V8 tac question The cable driven tachs for these truck are for diesel engine trucks and lens only go to 4000 rpms



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