Need pic of tach wire through firewall - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972SUPERSB · 10-09-2012, 12:40 AM

Does anybody have a picture of the correct location of where the tachometer wire should come through the firewall? Mine comes out with the speedo cable I'm sure this is not right. Thanks
Posted via Mobile Device

**Already Gone** · 10-09-2012, 01:32 AM

Subscribed
Posted via Mobile Device

**lolife99** · 10-09-2012, 07:48 AM

I think 72BlckButy had a thread on this.
I'll look.

**lolife99** · 10-09-2012, 07:51 AM

This is where Nate drilled the hole on his '69.
Were there different locations for different year trucks?

**FirstOwner69** · 10-09-2012, 01:19 PM

The Assembly Manual shows different routings (I think two) for the wire depending on the year. The location above appears correct for 72. As I recall (don't have the manual here) it shows the wire passing through one of the grommets near the distributor for at least the 69s and earlier. I think it's the grommet the oil gauge line passes through.

If someone has other definitive info regarding the original factory routing for the 69s I'd be very interested.

rustypu · 10-09-2012, 05:45 PM

I just drilled one today, the above pic is correct. I checked a 72 GMC W/tach before I drilled

Twisted78SS · 10-09-2012, 05:59 PM

This might show the early cab style, not 100% sure

weaintscared · 10-09-2012, 07:37 PM

Subscribed.
Posted via Mobile Device

67chevy1series · 10-09-2012, 11:22 PM

does anyone know where the whole is on a 67 68 cab?

1972SUPERSB · 10-10-2012, 12:00 AM

Quote:

Originally Posted by lolife99

This is where Nate drilled the hole on his '69.
Were there different locations for different year trucks?

These pics will help a bunch. I'm gonna drill mine tomorrow
Posted via Mobile Device

**FirstOwner69** · 10-10-2012, 12:50 AM

Quote:

Originally Posted by 67chevy1series

does anyone know where the whole is on a 67 68 cab?

As I noted above in post 5, the Assembly Manual shows it going through an existing grommet (I think the one the oil line goes through) for the 69s and, I believe, the 67s and 68s as well. I don't have the assembly manual with me, but I can double check in a couple days and post that info.

It would be great if owners of 69 and earlier trucks equipped with tachs from the factory could confirm if this is what was actually done. I plan to put a tach dash in my 69 and would like to know also.

**gmc 2500 4x4** · 10-22-2016, 05:15 AM

good info. how about a vacuum line?

10-09-2012, 12:40 AM	#1
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	Need pic of tach wire through firewall Does anybody have a picture of the correct location of where the tachometer wire should come through the firewall? Mine comes out with the speedo cable I'm sure this is not right. Thanks Posted via Mobile Device __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior

10-09-2012, 01:32 AM	#2
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,130	Re: Need pic of tach wire through firewall Subscribed Posted via Mobile Device __________________ 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

10-09-2012, 07:48 AM	#3
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,703	Re: Need pic of tach wire through firewall I think 72BlckButy had a thread on this. I'll look. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

10-09-2012, 07:51 AM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,703	Re: Need pic of tach wire through firewall This is where Nate drilled the hole on his '69. Were there different locations for different year trucks? Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

10-09-2012, 01:19 PM	#5
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,846	Re: Need pic of tach wire through firewall The Assembly Manual shows different routings (I think two) for the wire depending on the year. The location above appears correct for 72. As I recall (don't have the manual here) it shows the wire passing through one of the grommets near the distributor for at least the 69s and earlier. I think it's the grommet the oil gauge line passes through. If someone has other definitive info regarding the original factory routing for the 69s I'd be very interested.

10-09-2012, 05:45 PM	#6
rustypu Registered User Join Date: Mar 2012 Location: Barnstead NH Posts: 35	Re: Need pic of tach wire through firewall I just drilled one today, the above pic is correct. I checked a 72 GMC W/tach before I drilled

10-09-2012, 05:59 PM	#7
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Re: Need pic of tach wire through firewall This might show the early cab style, not 100% sure __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired

10-09-2012, 07:37 PM	#8
weaintscared Registered User Join Date: Mar 2011 Location: Sumter SC Posts: 439	Re: Need pic of tach wire through firewall Subscribed. Posted via Mobile Device

10-09-2012, 11:22 PM	#9
67chevy1series Registered User Join Date: Mar 2010 Location: a t w a t e r cali 95301 Posts: 10,713	Re: Need pic of tach wire through firewall does anyone know where the whole is on a 67 68 cab?

10-22-2016, 05:15 AM	#12
gmc 2500 4x4 Senior Member Join Date: Mar 2012 Location: ripley ny Posts: 2,930	Re: Need pic of tach wire through firewall good info. how about a vacuum line?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.