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#1 |
Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Tach wire termination if no tach
Does anybody know where the brown tach wire terminates under the dash if you do not have a tach on the truck?
I am buying the combo tach/fuel gauge from these guys, and would like to have some idea of where to look for the other end of that wire. It is there, it comes off the distributor and heads into the cab, I just don't know where it ends up. Yet. http://www.gmsports.com/content/new-...and-gmc-trucks
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Rich Weyand 1978 K10 RCSB DD. |
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#2 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Tach wire termination if no tach
You should have a loose connector under your dash if your truck originally came with a tach. It will be a connector with three terminals that plug into the back of the tach directly. You should have 12V power, ground and tach (brown wire to coil).
If your truck did not come factory with a tach, the factory tach harness would not be there. If there was an aftermarket tach, the wire to the coil is usually green. You should be able to purchase a tach wiring harness for your truck if needed.
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#3 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Tach wire termination if no tach
I agree with TBONE1964 ... it should lead back to a 3-terminal connector under the dash if your truck originally had a factory tach.
There were a few other factory systems (besides tachometers) that sometimes plugged into the HEI tach terminal though. Like the ECM on some electronic feedback carburetor systems for example. And some engines had the idle speed solenoid on the carb wired into a "speed switch" that had a wire plugged into the HEI tach terminal. That was primarily on mid 80's 1-ton trucks though (and they'd changed from a brown to a white tach wire by then) ... here's a diagram of that setup that also shows how a factory tach would tie into that system: ![]() |
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#4 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Tach wire termination if no tach
Quote:
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#5 | |
Registered User
Join Date: Jun 2011
Location: Baytown TX
Posts: 2,219
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Re: Tach wire termination if no tach
Quote:
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John 82 Chevy Silverado 350ci/TH350 ![]() |
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#6 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Tach wire termination if no tach
Well there you have it. Right from someone who did the exact same thing.
Good information here ![]()
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#7 |
Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: Tach wire termination if no tach
No tach on it now, and far as I know, there never was, but there is the brown wire there. Wondered if it would be easier to patch into that than run the wire provided with the gauge all the way to the distributor.
It's really cool that the combo gauge plugs right into the basket. The original combo gauge that they used on the medium trucks in the seventies had the fuel gauge terminals lower, so you have to cobble that in. This aftermarket gauge was constructed specifically to be plug-and-play in our trucks by this seller. They tell me they sell a lot of them. Thanks everybody. This should go in quick -- other than disassembling the instrument panel yet again. <sigh>
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Rich Weyand 1978 K10 RCSB DD. |
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