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04-23-2012, 01:19 PM
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#1 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Guys with tachs?
Ok, I got this tach cluster for my 84, its out of an 80's C50/60 and I've got a question or two.
First is, after hooking up the tach can I just plug the instrument cluster in to the old hook up and will it work? or do I need to do something with the circuit board?
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04-23-2012, 01:45 PM
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#2 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Guys with tachs?
The circuit board is different. You need to replying and adapt the wiring
Posted via Mobile Device
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04-23-2012, 02:00 PM
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#3 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: Guys with tachs?
Does anyone have the circuits schematics showing were to adapt the wiring?
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04-23-2012, 04:45 PM
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#4 |
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Registered User
Join Date: Nov 2010
Location: Windsor Locks
Posts: 628
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Re: Guys with tachs?
You'll need to know what year the tach cluster came from. depending on the year it may be plug and play.
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04-23-2012, 05:28 PM
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#5 |
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Registered User
Join Date: Dec 2007
Location: Palmer, Alaska
Posts: 13,821
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Re: Guys with tachs?
80 up should have the orange font. I put an orange one in my old 80 short bed.
I just compared the circuits to the cluster originally in my truck. Turned out to be the same. Plugged it in and everything worked great. Posted via Mobile Device
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04-23-2012, 08:19 PM
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#6 |
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Registered User
Join Date: Dec 2011
Location: Regina, SK, Canada
Posts: 622
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Re: Guys with tachs?
I just did a repair on my 79. Pretty ez stuff. If yours is the same as mine, which I assume it is I would forget the circuit board and just wire in the tach with some wire. The tachs are clearly marked on the rear posts +, - and tach. Just wire the the + to a switched ignition source, - to ground and the other wire to the tach terminal on your distributor.
Then you don't have to worry about the circuit board and wether the rest of the rig is wired for the tach. Here was an excellent article, helped repair my tach which was reading about 1000rpm too high. http://howtoalmanac.com/kevin/projec...chfixtruck.htm
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1979 Chevy Dually Crew 4X4 454, D60 Tru-trac, D70 Detroit Locker, 3.73, 4L80E/NP205 1971 GMC 3/4 Ton 4X4 |
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04-23-2012, 08:29 PM
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#7 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: Guys with tachs?
I am just wiring the tach in the same way it was wiring in to the old truck, with the three wires coming out of it. My question is about the rest of the gauges, I noticed that the wiring harness out of the c50/60 doesn't have as many connections as the harness that is in my truck. Plus some of the connecting points don't line up with c50/60 cluster.
Can I move some of the connecting points in the harness to line up with the circuit board?
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2020 Silverado Trail Boss - 6.2/10spd |
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04-23-2012, 08:57 PM
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#8 |
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Chevy Enthusiast
Join Date: Jul 2009
Location: Canyon Lake Texas
Posts: 2,024
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Re: Guys with tachs?
Make sure the cluster out of the C50 doesn't have a amp gauge, if so your looking at a fire. Change it out if it does, then repin the connector so everything goes where it is supposed to go. The tack will more than likely read incorrectly, here's everything showing how I fixed mine: http://67-72chevytrucks.com/vboard/s...d.php?t=503733
Im glad you got yours fixed too bilfman!
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Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress) |
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04-23-2012, 09:04 PM
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#9 |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: Guys with tachs?
This is the cluster I got
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04-23-2012, 09:16 PM
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#10 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Guys with tachs?
Hope you have a 6 cylinder.
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Why is every used 350 sbc out of a corvette? There's only two things that excite a man, expensive toys and real expensive toys. VEGETARIAN: That's an old Indian word meaning "I don't hunt so good." When the going gets tough, switch to power tools. |
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04-23-2012, 09:18 PM
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#11 | |
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Canadian Trucker
Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
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Re: Guys with tachs?
Quote:
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2020 Silverado Trail Boss - 6.2/10spd |
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04-23-2012, 09:19 PM
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#12 |
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Getting Old; Going Broke
Join Date: Apr 2010
Location: Owasso OK
Posts: 2,764
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Re: Guys with tachs?
4000 tach is no doubt from a 6 cylinder diesel. Would have to be reworked to read an 8 cylinder correctly.
__________________
Why is every used 350 sbc out of a corvette? There's only two things that excite a man, expensive toys and real expensive toys. VEGETARIAN: That's an old Indian word meaning "I don't hunt so good." When the going gets tough, switch to power tools. |
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04-23-2012, 09:33 PM
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#13 |
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Chevy Enthusiast
Join Date: Jul 2009
Location: Canyon Lake Texas
Posts: 2,024
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Re: Guys with tachs?
If you add that potentiometer to the back im pretty confident that it could be adjusted to where it is supposed to be on a 8 cyl.
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Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress) |
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04-23-2012, 09:40 PM
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#14 |
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Salty Sailor
Join Date: May 2009
Location: Savannah, Ga
Posts: 603
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Re: Guys with tachs?
maxed out at 4k rpm? you need at least 5k for a v8. you should look into getting an 80's camaro tach
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86 c-10 Custom Deluxe Savannah, Georgia |
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04-23-2012, 10:01 PM
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#15 |
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Registered User
Join Date: Jun 2011
Location: Baytown TX
Posts: 2,219
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Re: Guys with tachs?
You could get a replacement 5k or 7k tach for that cluster since the tach is independent from the cluster curcit and has its own harness.
http://67-72chevytrucks.com/vboard/s...d.php?t=503733
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John 82 Chevy Silverado 350ci/TH350
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