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So I came across this video on YouTube where the person replacing his cluster had made a plug system so it's easier to install/remove instead of having to mess with each wire individually.

Has anyone done this? If so, any tips or pointers?

Here is the video, it looks pretty neat/easy but with old Mustang wiring, I wonder if it is truly that easy:

 

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I have done this. It truly is nice when you go to pull the cluster and you can just disconnected as a unit. One thing I would urge would be to add an extra foot a wiring so you can pull the cluster out and then disconnect your plug or you can disconnect it from under the Dash . I just coil up the extra wire under the dash. Also, all of my gauges are aftermarket so I don't have to use anything from the original wiring harness.
 

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Probably wouldn't do it on factory wiring, but if you are replacing the harness, or have a reason to be removing your instrument cluster, it probably wouldn't be a bad idea. Use something like the Molex connectors, There are lots of individual pieces you will need to buy to complete the plugs, and possibly some specialized tools. I use Weatherpack connectors for protecting the connections from the elements but for under the dash, you wouldn't need that, unless you have a leaky cowl.
 

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The 67's have disconnects like that from the factory. There are 3 of them instead of just the one but it makes it pretty easy to get the dash out.
 

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Similar story here - rewired the car with AAW kit and we added connectors (one one but several) so that you can remove the whole cluster (gauges, bezel, rear metal housing) as one piece. I have not had to remove it but good to know I can if needed.
 

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I do this on every car I build. Much easier to remove/replace the cluster without scratching the dash and steering column.

Painless Performance makes plugs/receptacles in various pin counts that are very nice and not that expensive. This is a 15 pin example:



WeatherPak connectors would work fine, too. But they are more expensive and you don't need sealed connectors under the dash.
 

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6" Assembled Black Deutsch 2,3,4,6,8,12 Pin,14 AWG waterproof connector wire


This is what you are needing. I used one when putting in my gauges.



That's a good price on those Deutsh connectors. The kits to assemble them are around $150.
 

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I did it on my 65 and glad I did. I put one connector for the wiring on one side of the speedometer, and did the same on the other side. Definitely easier getting the instrument panel out.
 

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I've done this on both my cars. My advice is to take you time, solder all connections, use shrink tubing and zip ties to make it tidy.
 
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