Factory Tach Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 07-19-2007, 04:13 PM

Is this normal? I've been driving the truck for 5 years and just noticed that when it is shut off the tach is parked between the 0 and 5 . If it isn't can anyone tell me what the problem could be. I bought the truck with the tach in it although the truck didn't come from the factory with the tach option.

**StingRay** · 07-19-2007, 04:42 PM

I think mine had an adjustment screw on the back ( been 10 years since I've looked at it)for calibration. I believe I struck a happy medium between correct calibration and zero reading when off.

**Already Gone** · 07-19-2007, 06:09 PM

Ttt

cstanley · 07-19-2007, 06:13 PM

yup, mine has the exact same problem. i tried tinkering with the calibration screw, but couldn't get it to rest at 0. perhaps there's another screw you might look for.

i'll be installing a new dash bezel soon, so i'll check to see if there's some sort of reset and let this thread know...

btw I adjusted mine as far down as i could (it started around 700) and REALLY threw the tach out of whack... be careful.

07-19-2007, 04:13 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Factory Tach Question Is this normal? I've been driving the truck for 5 years and just noticed that when it is shut off the tach is parked between the 0 and 5 . If it isn't can anyone tell me what the problem could be. I bought the truck with the tach in it although the truck didn't come from the factory with the tach option. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

07-19-2007, 04:42 PM	#2
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Factory Tach Question I think mine had an adjustment screw on the back ( been 10 years since I've looked at it)for calibration. I believe I struck a happy medium between correct calibration and zero reading when off. __________________ Saskatoon, Saskatchewan Canada

07-19-2007, 06:09 PM	#3
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Factory Tach Question Ttt __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

07-19-2007, 06:13 PM	#4
cstanley Senior Member Join Date: Oct 2005 Location: Austin, TX Posts: 1,229	Re: Factory Tach Question yup, mine has the exact same problem. i tried tinkering with the calibration screw, but couldn't get it to rest at 0. perhaps there's another screw you might look for. i'll be installing a new dash bezel soon, so i'll check to see if there's some sort of reset and let this thread know... btw I adjusted mine as far down as i could (it started around 700) and REALLY threw the tach out of whack... be careful. __________________ "Anybody who would paint his truck like this, would go to a minister's funeral dressed in feathers!" - Big Enis Burdett '72 Blazer Restoration Blog: http://sportchicken.blogspot.com/

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