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07-01-2006, 11:50 PM | #1 |
Senior Member
Join Date: Jun 2003
Location: Westminster, CO
Posts: 3,071
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Who's got a picture and hole size...
for where the tach factory wiring came through the firewall? I know how it all wires in the cab and have a factory tach harness...just need to drill correct size hole in the correct location.
Thanks! |
07-02-2006, 06:36 AM | #2 |
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Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Who's got a picture and hole size...
Here is a picture of the factory hole location on a 72 Suburban firewall. The hole for the grommet on the tach wire is 3/4" and is located between the bulkhead connector and the E-brake cable hole. There are "dimples" in the firewall for the location of the hole(s) to be drilled.
Jim |
07-02-2006, 10:49 AM | #3 |
Senior Member
Join Date: Jun 2003
Location: Westminster, CO
Posts: 3,071
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Re: Who's got a picture and hole size...
Thank you very much Jim! Perfect pic of what I needed! Guess I need a 3/4" hole bit....Home Depot here I come!
Anyone adding a tach to a non tach truck....save this pic!!! Alex Last edited by ChevyDude; 07-02-2006 at 11:32 AM. |
07-02-2006, 11:00 AM | #4 |
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Join Date: May 2006
Location: Springfield, IL
Posts: 36
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Re: Who's got a picture and hole size...
I recently purchased a painless wirin harness for my 84 C20 and also want to change out my warning lights to actual gauges and add a Tach. are there any good diagrams for that and where can i get the sending units a well?
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07-03-2006, 09:17 AM | #5 |
Never enough time!!
Join Date: Mar 2004
Location: sw Wisconsin
Posts: 601
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Re: Who's got a picture and hole size...
In a 67 cab that hole is 1'' diameter...or at least mine is and it doesn't look like it has been drilled out.
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07-03-2006, 09:41 PM | #6 |
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Join Date: Jul 2001
Location: Muskegon,MI,USA
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Re: Who's got a picture and hole size...
The factory punched the holes as can be seen on the picture of the Burb firewall. I was not sure of the year that ChevyDude has so I made sure he knew that it was a 72. I did not have a 67 to take a picture of, so if yours is different, maybe you should post a picture of it as some of these details were changed over the years.
Jim |
07-03-2006, 10:51 PM | #7 |
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Join Date: Sep 2004
Location: Pleasanton, TX
Posts: 1,723
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Re: Who's got a picture and hole size...
The tach wiring is,, one wire to the tach side of distributor cap?? Corrct me if I'm wrong. The end that plugs into the dizzy would fit through a .. 3/8" hole? 1/2" at the most? Why make a hole bigger than necessary? As long as you have a grommet to fit, I think I'd make the hole as small as possible. JMO
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07-04-2006, 02:17 AM | #8 |
Senior Member
Join Date: Jun 2003
Location: Westminster, CO
Posts: 3,071
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Re: Who's got a picture and hole size...
Mine is a 71' and a 71' factory tach harness from M&H has a 3/4" grommet.
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07-04-2006, 07:49 AM | #9 |
Never enough time!!
Join Date: Mar 2004
Location: sw Wisconsin
Posts: 601
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Re: Who's got a picture and hole size...
My truck is at the body shop right now...I'll get a picture of it next time I get a chance. In my LMC book 67 is a different part number for the tach wiring harness than 68-72, possibly just because of the grommet size?
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