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12-30-2008, 11:32 PM
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#1 |
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Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
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Tach wire through firewall
I know this has probably been discussed but I have searched the site for two days can't seem to find the answer. I have a 71 and want to route the tach wire through the firewall. I know the hole is to the left of the bulkhead but I don't know what size hole I should drill. The Tach wire is from the typical tach wiring kit eveyone sells. Can someone answer this?
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12-31-2008, 12:23 AM
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#2 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: Tach wire through firewall
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Not off the top of my head. I just ran my wires yesterday but the hole was already there on mine so I didn't have a reason to check it for size. I will try and check it in the morning. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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12-31-2008, 06:20 AM
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#3 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Tach wire through firewall
The hole size for the tach grommet is 3/4". Here is a pic of the factory hole.
Jim
__________________
1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 07-14-2009 at 12:53 PM. |
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12-31-2008, 08:41 AM
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#4 |
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Nothing to see here.....
Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: Tach wire through firewall
I just ran my tach harness wire a few weeks ago. I used Jim's picture as a reference and it was perfect! There will be a cardboard knockout you have to remove inside the cab as well. Then once the brown wire is through the bulkhead, it will run up to the plastic gutter, across the transmission tunnel, then down to the coil.
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Doug  THANK YOU to our American Soldiers & Veterans - POW MIA "You will NEVER be forgotten". The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson Last edited by tcb-1; 12-31-2008 at 08:44 AM. |
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12-31-2008, 11:22 AM
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#5 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,771
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Re: Tach wire through firewall
Quote:
Thanks for posting that Jim... Saved me a trip to the shop. Now I can stay on the board longer...  LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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01-01-2009, 12:06 AM
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#6 |
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Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
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Re: Tach wire through firewall
Yes Jim thank you very much. I plan to write the dimension on the tach page in my assembly manual since it references a page in UPC 1 that is not in the assembly manual.
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01-01-2009, 02:56 AM
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#7 |
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Registered User
Join Date: Jun 2006
Location: Indiana
Posts: 4,859
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Re: Tach wire through firewall
Or you could use the factory wiring block. There are empty slots ready to use.
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'70 GMC C1500 LWB Power disc brakes. WooHoo! Posi 6 Lug Dana 60 |
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