1977 -78 Gauge questions

[Dead Parrot]

If you are referring to the gauge cluster connector, YES, they physically stayed the same from 73~87 and even the later square Suburbans used the same connector. (found a cluster in a 89? 4WD burb that I have repurposed for my 75 C10). Not installed yet. You can move the pins around on the connector but you will have to match the printed circuit board. If you can find a yard square, the cluster connector is often one of the last things taken. Get a couple spares, one to test on your cluster while on the bench and one for spare pins. Once you figure out how the wires need to be arranged, move the ones in your 77 to match and add any new ones.

Make use of the many wiring diagrams available on the forum.