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#1 |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Where does the tach wire go through the firewall?
Like the title says. I have a nice tach dash to install and I have the wire with the grommet that goes in the fire wall. I want to know where the correct location for that wire to go through the firewall.
Thanks Mark |
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#2 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
To the right of the fuseblock(standing in front of the truck) There are a whole bunch of factory detents running horizontal in this area and you can pick one to drill out. There is a pic around here, bin used alot, I'll see if I can find it
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#3 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
It's on page 36, post #881 of my thread on the blazer side...sorry don't know how to do links
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#4 |
C/10 CLUB MEMBER
![]() Join Date: Jul 2003
Location: Lakewood, CA
Posts: 993
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Re: Where does the tach wire go through the firewall?
Mark,
Glad you brought this one up I am curious myself. I will be adding an original tach to my instruments as well and would like it to be as close to the original location as possible. Ron
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-Ron- ![]() |
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#5 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
On the Blazers there is a factory grommet in that location, I believe it is for the backup lights(brown wire)
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#6 |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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Re: Where does the tach wire go through the firewall?
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#7 |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Re: Where does the tach wire go through the firewall?
Thank you!!
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#8 |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Re: Where does the tach wire go through the firewall?
Yesterday I tried to install the wire in that 3/4 inch hole and the hole is to big for the grommet that comes with that wire. Anyone have any pics of the tach wire installed in that hole?
There is also some extra metal on the inside of that hole but it is not flat so I don't think I could just drill that out to the grommet size? |
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#9 |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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Re: Where does the tach wire go through the firewall?
I had saved this picture on my computer and have no idea who to credit for it...
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#10 |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Re: Where does the tach wire go through the firewall?
That is the 3/4 inch hole I was referring to when I said it is bigger than my tach wire grommet. That picture is linked above in CPNEs post
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#11 | |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
Quote:
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#12 | |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Re: Where does the tach wire go through the firewall?
Quote:
Where did you get yours if the groove is in fact 3/4 I would get a different tach wire harness if I can use that hole? Thanks |
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#13 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
Pretty sure it's the groove, but will remeasure tomorrow. I may have an extra one, since I ordered my engine harness w/ tach
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#14 |
Senior Member
Join Date: Jun 2007
Location: Pine Ridge Florida
Posts: 4,125
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Re: Where does the tach wire go through the firewall?
Thanks
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#15 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,515
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Re: Where does the tach wire go through the firewall?
Yep, just checked! The groove is .750, +/- .020. My extra harness is for a coil setup, but can be changed for a HEI w/plug. LMK if you need it, just shipping, then this thread doesn't turn into a WTB and get locked
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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