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Re: Cluster swap question
78 changed to electric oil gauge. If you are using a 78 cluster in a 77 truck, you will have to run a wire from the sender and wire per the 78 schematic for this to work.
That is the big change on the cluster between 77 and 78.
I see just from looking at the chart, there are some other differences. Turn indicators for example, in a different location on a 78.
Hope this helps,
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