1973-1979 Tachometer? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Factory Guy** · 10-01-2019, 10:20 PM

I am wanting to install the factory style tach in the fuel gauge location and place the fuel gauge in the brake lite location has anybody else done this conversion?

Not really wanting to buy the used parts off of ebay or ? I have read to many stories of used or NEW NOS ones not working. So I plan to go with a repop kit like LMC shows in the photo.

**Factory Guy** · 10-01-2019, 10:24 PM

***Anybody know what that big white hole is in the tach face at the bottom?***

**Factory Guy** · 10-01-2019, 10:26 PM

As my gauges do not have that hole

dmack91 · 10-01-2019, 10:32 PM

Indicator lights. Not sure which ones on your application, but some possibilities are brake, seat belt, 4x4....

**MJN** · 10-02-2019, 08:47 AM

Besides the gauges, you will also need a different printed circuit and white plastic housing to accommodate the tach and fuel gauge. The tach also uses a stand alone harness that is not part of the printed circuit. The large window is for indicator lights as was mentioned. The older '73/'74 tachs did not have an indicator light window, the brake light indicator with tach was in the speedometer. The information at this link should help answer some of your questions as the gauges and clusters changed through the years.
http://www.73-87.com/7387garage/inte...achometers.htm

Since you already have gauges it will be a direct plug in to your cab harness with the correct printed cluster circuit.

Dead Parrot · 10-02-2019, 11:42 AM

I bought the same gauges for a cluster I pulled from an 89 Suburban with the idea of putting it in my 75. Plan got put on hold due to buying 80 acres and moving. The 89 cluster had a red plate for Brakes and Seat Belts behind the gas gauge. Was thinking of re-purposing the Seat Belt side into a Hot or Oil idiot light backup to the gauges. There are enough cluster pins to have both gauges and some idiot lights and IIRC, the 89 Suburban had 4-wheel drive so every possible light socket had a circuit trace to it. I think the pair behind the speedo was 4-wheel drive and Check Engine.

**Factory Guy** · 10-02-2019, 10:07 PM

Thanks everybody for your help I really appreciate it.

**dagnabbitt** · 10-02-2019, 10:40 PM

Quote:

Originally Posted by Factory Guy

Thanks everybody for your help I really appreciate it.

Good luck with the tach swap, a factory gauge is really nice to have and you will love it. Beware, as soon as I did mine I got to thinking I needed to reduce my rpms and started a 700r4 rebuild. Everything you do leads to more money but its a great hobby and totally worth whatever time you put into it.

Post pics of your progress, this is something everyone wants to do eventually and this site is a great resource that you can be a part of.

**Factory Guy** · 10-02-2019, 10:58 PM

Quote:

Originally Posted by dagnabbitt

Good luck with the tach swap, a factory gauge is really nice to have and you will love it. Beware, as soon as I did mine I got to thinking I needed to reduce my rpms and started a 700r4 rebuild. Everything you do leads to more money but its a great hobby and totally worth whatever time you put into it.

Post pics of your progress, this is something everyone wants to do eventually and this site is a great resource that you can be a part of.

Thanks for the words of encouragement. Truck has 4.11 gears so thats why I want the tach to see how high she is revving. don't know if I will go for an over drive trans or a GEAR VENDORS overdrive.

I have a thread of the truck and what I have done to her so far at:

http://67-72chevytrucks.com/vboard/s...d.php?t=791250

10-01-2019, 10:20 PM	#1
Factory Guy Senior Member Join Date: Jun 2019 Location: Midway USA Kentucky Posts: 566	1973-1979 Tachometer? I am wanting to install the factory style tach in the fuel gauge location and place the fuel gauge in the brake lite location has anybody else done this conversion? Not really wanting to buy the used parts off of ebay or ? I have read to many stories of used or NEW NOS ones not working. So I plan to go with a repop kit like LMC shows in the photo. Attached Images

10-01-2019, 10:24 PM	#2
Factory Guy Senior Member Join Date: Jun 2019 Location: Midway USA Kentucky Posts: 566	Re: 1973-1979 Tachometer? *Anybody know what that big white hole is in the tach face at the bottom?* Attached Images

10-01-2019, 10:26 PM	#3
Factory Guy Senior Member Join Date: Jun 2019 Location: Midway USA Kentucky Posts: 566	Re: 1973-1979 Tachometer? As my gauges do not have that hole Attached Images

10-01-2019, 10:32 PM	#4
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 763	Re: 1973-1979 Tachometer? Indicator lights. Not sure which ones on your application, but some possibilities are brake, seat belt, 4x4.... __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress

10-02-2019, 08:47 AM	#5
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	Re: 1973-1979 Tachometer? Besides the gauges, you will also need a different printed circuit and white plastic housing to accommodate the tach and fuel gauge. The tach also uses a stand alone harness that is not part of the printed circuit. The large window is for indicator lights as was mentioned. The older '73/'74 tachs did not have an indicator light window, the brake light indicator with tach was in the speedometer. The information at this link should help answer some of your questions as the gauges and clusters changed through the years. http://www.73-87.com/7387garage/inte...achometers.htm Since you already have gauges it will be a direct plug in to your cab harness with the correct printed cluster circuit. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

10-02-2019, 11:42 AM	#6
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,617	Re: 1973-1979 Tachometer? I bought the same gauges for a cluster I pulled from an 89 Suburban with the idea of putting it in my 75. Plan got put on hold due to buying 80 acres and moving. The 89 cluster had a red plate for Brakes and Seat Belts behind the gas gauge. Was thinking of re-purposing the Seat Belt side into a Hot or Oil idiot light backup to the gauges. There are enough cluster pins to have both gauges and some idiot lights and IIRC, the 89 Suburban had 4-wheel drive so every possible light socket had a circuit trace to it. I think the pair behind the speedo was 4-wheel drive and Check Engine.

10-02-2019, 10:07 PM	#7
Factory Guy Senior Member Join Date: Jun 2019 Location: Midway USA Kentucky Posts: 566	Re: 1973-1979 Tachometer? Thanks everybody for your help I really appreciate it.



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