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08-31-2013, 04:07 PM
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#1 |
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Registered User
 Join Date: Aug 2013
Location: Va
Posts: 165
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Cluster Question
I'm getting ready to replace the gauge cluster in my truck. I currently have a cluster with gauges minus the tach and vacuum gauge. The cluster I'm getting has the tach and vacuum gauge. Since I have the HEI I've been told I will need an upgraded tach wiring harness. I don't know what I will need to make the vacuum gauge work and if the upgraded tach wiring harness is all I will need for the tach. Can anyone help with what I will need to make these work?
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08-31-2013, 05:05 PM
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#2 |
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Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,204
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Re: Cluster Question
For vacuum gauge, just run a vacuum line to a manifold vacuum port (like the modulator if you have an automatic), for the tach, I got the HEI harness from Classic Parts.
I DON'T have the tach filter in mine, but mine is a factory tach. I've heard that aftermarket tachs burn out a lot easier than factory (go figure).
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71 K20 64 GMC mud truck |
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08-31-2013, 05:21 PM
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#3 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,843
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Re: Cluster Question
I bought my tach harness on eBay from Roger Koop who is now a forum member ("RogerKoop").
You will probably also need to drill a 3/4" hole for the tach wire grommet. There are threads showing where the hole should be to the driver side of the firewall harness connector. |
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08-31-2013, 05:25 PM
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#4 |
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Registered User
Join Date: Aug 2013
Location: Va
Posts: 165
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Re: Cluster Question
Awesome thanks for the information
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08-31-2013, 05:32 PM
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#5 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Cluster Question
I have the factory tach in the 71 now for over 20 years. I have stock wiring to HEI dizzy and not one problem. The only thing is I had to use spade connectors to connect it to the cap.
 
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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08-31-2013, 05:47 PM
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#6 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,996
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Re: Cluster Question
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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